En els primers passos de l'aviació militar, diferents serveis aeris van desenvolupar diferents mètodes d'acreditació de victòries aèries. Cap d'aquests sistemes era 100% fiable i eren constantment subjectes a variacions. De fet, el nombre de victòries per a ser considerat com un as oficialment variava depenent del servei militar.
Els alemanys no utilitzaven el terme as sinó que es referien als pilots alemanys amb 10 victòries com a Überkanone, assignant cada victòria a un pilot en concret, i només després d'haver verificat visualment la destrucció total o parcial de l'aparell enemic. El sistema de l'Armee de l'Air francesa només comptava els aparells totalment destruïts, però acreditaven a tot aquell pilot o observador que hagués participat en la victòria, que en alguns casos podien ser diversos individuals. La majoria de les altres nacions (inclosos els Estats Units) van adoptar el sistema francès. Els aparells britànics lluitaven normalment sobre territori alemany, i per tant no podien fer servir el mateix mètode que els alemanys, de verificar visualment totes les victòries. Al principi les batalles resultaven sovint en l'oponent forçat a aterrar o expulsat del territori essent obligat a marxar cap al seu territori. Per això, els britànics acreditaven combats categoritzats de decisius per els mateixos comandants d'esquadró; podent incloure aparells alemanys expulsats del territori o aparells que havien estat vistos per última vegada for a de control sense verificar si realment havien acabat estavellant-se. Les acreditacions dels russos reflectien a vegades victòries on l'enemic no havia estat totalment destruït. El terme as mai va ser utilitzat oficialment per els britànics.
Tot i que l'estatus d'as era sovint associat als pilots de caça, tant els bombarders com els aparells de reconeixement, i observadors en aparells biplaça com per exemple el Bristol F.2b (Bristol Fighter) també obtenien victòries sobre l'enemic. En ambdós bàndols, si un aparell biplaça aconseguia una victòria, aquesta era acreditada a ambdós membres de l'equip, tant el pilot com l'observador/metralladora. Com que alguns pilots formaven equips amb diversos observadors/metralladora en aparells biplaça, es podia donar el cas de que els observadors fossin asos mentre que els pilots no.
| As |
País |
Servei Militar |
Victòries |
Anotacions |
| Paul Achilles |
Germany |
Luftstreitkräfte |
8 |
|
| John William Aldred |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross with Bar |
| Gerald Anderson |
Sud-àfrica |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Flaminio Avet |
Itàlia |
Corpo Aeronautico Militare |
8 |
|
| Geoffrey Bailey |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Paul Barbreau |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| Charles Bartlett |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Service Cross with Bar |
| Donald Beard |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Ludwig Beckmann |
Germany |
Luftstreitkräfte |
8 |
|
| Edwin Benbow |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Maurice Benjamin |
Sud-àfrica |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Henry Bizou |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Giles Blennerhasset |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Karl Bohny |
Germany |
Luftstreitkräfte |
8 |
|
| Aloys Freiherr von Brandenstein |
Germany |
Luftstreitkräfte |
8 |
|
| Clive Brewster-Joske |
Austràlia |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Edric Broadberry |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Alfred John Brown |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Howard Burdick |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, British Distinguished Flying Cross |
| Ernesto Cabruna |
Itàlia |
Corpo Aeronautico Militare |
8 |
|
| Alvin Callender |
United States |
Royal Flying Corps, Royal Air Force |
8 |
|
| James Child |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, Belgian Order of Leopold, Belgian Croix de Guerre |
| Henry Clay |
United States |
Royal Flying Corps, US Army Air Service |
8 |
Distinguished Service Cross, British Distinguished Flying Cross |
| Robert David Coath |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Edwin Cole |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Hamilton Coolidge |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, Croix de Guerre |
| James Coombe |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Dieudonne Costes |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| Leslie Court |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
French Medaille Militaire |
| William Craig |
Canada |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Flying Cross |
| Otto Creutzmann |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Henry Crowe |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| James Dawe |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Gilbert De Guingand |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| John D. De Pencier |
Canada |
Royal Flying Corps, Royal Air Force, Royal Canadian Air Force |
8 |
|
| Gunther Dobberke |
Germany |
Luftstreitkräfte |
8 |
|
| Percy Douglas |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Peter Roy Maxwell Drummond |
Austràlia |
Royal Flying Corps, Royal Air Force |
8 |
Order of the Bath, Order of the British Empire, Distinguished Service Order with Bar, Military Cross. Rose to Air Marshal. |
| Gordon Duncan |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| William Durrand |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Harold E. Easton |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Friedrich Ehmann |
Germany |
Luftstreitkräfte |
8 |
|
| Leonard Herbert Emsden |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Conduct Medal |
| William Portwood Erwin |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, French Croix de Guerre |
| Dudley Lloyd Evans |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, Distinguished Flying Cross |
| Walter Ewers |
Germany |
Luftstreitkräfte |
8 |
|
| Harold R. Eycott-Martin |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Garfield Finlay |
Austràlia |
Australian Flying Corps |
8 |
Distinguished Flying Cross Rose to Wing Commander in RAAF. |
| Desmond Fitzgibbon |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Service Cross |
| Georges Flachaire |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre, British Military Cross |
| Austin Lloyd Fleming |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Jean Alfred Fraissinet |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Croix de Guerre |
| Hans-Eberhardt Gandert |
Germany |
Luftstreitkräfte |
8 |
Royal House Order of Hohenzollern, Iron Cross. Rose to rank of General Major. |
| Jacques Gerard |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| Cyril Gladman |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Clive Glynn |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Max Gossner |
Germany |
Luftstreitkräfte |
8 |
|
| James Grant |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Medal |
| Eustace Grenfell |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, Distinguished Flying Cross, Air Force Cross |
| Victor Groom |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross with Bar |
| Julien Geuertiau |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| Wolfgang Guettler |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Adolf Gutknecht |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Hans von Häbler |
Germany |
Luftstreitkräfte |
8 |
Royal House Order of Hohenzollern, Iron Cross |
| Reuben Hammersley |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
French Croix de Guerre |
| Frederick Harlock |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Herbert Hegarty |
Regne Unit |
Royal Flying Corps, Royal Air Force |
9 |
Military Cross |
| Alfred Hemming |
Sud-àfrica |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Heinrich Henkel |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| George Hicks |
Regne Unit |
Royal Air Force |
8 |
Distinguished Flying Cross |
| D'Arcy Fowlis Hilton |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, Air Force Cross |
| Ivan F. Hind |
Sud-àfrica |
Royal Flying Corps, Royal Air Force |
8 |
|
| Wilhelm Hippert |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| William Norman Holmes |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Medal |
| Thomas Stanley Horry |
Regne Unit |
Royal Air Force |
8 |
Distinguished Flying Cross |
| Richard Howard |
Austràlia |
Australian Flying Corps |
8 |
Military Cross |
| Hans Hoyer |
Germany |
Luftstreitkräfte |
8 |
|
| Paul Huettenrauch |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Hubert Hunt |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Medal |
| Frank Hunter |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, French Legion d'Honneur. Major General in WW II. |
| Michael Hutterer |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Fritz Jacobsen |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Clinton Jones |
United States |
US Army Air Service |
8 |
Distinguished Service Cross with Oak Leaf Cluster |
| Ernest G. Joy |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Kenneth William Junor |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Willi Kampe |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Karl Kaszala |
Imperi Austrohongarès |
Luftfahrtruppen |
8 |
German Iron Cross |
| Fritz Kieckhaefer |
Germany |
Luftstreitkräfte |
8 |
|
| Franz Kirchfeld |
Germany |
Luftstreitkräfte |
8 |
|
| Robert Kirby Kirkman |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Arthur Gerald Knight |
Canada |
Royal Flying Corps |
8 |
Distinguished Service Order, Military Cross |
| Sidney Knights |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Arthur Korff |
Germany |
Luftstreitkräfte |
8 |
|
| Heinrich Kostrba |
Imperi Austrohongarès |
Luftfahrtruppen |
8 |
Military Merit Cross, German Iron Cross |
| Fritz Krebs |
Germany |
Luftstreitkräfte |
8 |
|
| Antoine Laplasse |
França |
Aéronautique Militaire |
8 |
Medaille Militaire, Croix de Guerre |
| Kenneth Leask |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross with Bar. Rose to Air Vice-Marshal. |
| Forde Leathley |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Alvaro Leonardi |
Itàlia |
Corpo Aeronautico Militare |
8 |
Medal for Military Valor |
| Cecil Arthur Lewis |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross. Author, Oscar winner. |
| Alan Light |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| George Lloyd |
Sud-àfrica |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, Air Force Cross |
| Carlo Lombardi |
Itàlia |
Corpo Aeronautico Militare |
8 |
Medal for Military Valor |
| William Myron MacDonald |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| William John MacKenzie |
United States |
Royal Naval Air Service, Royal Air Force |
8 |
|
| Donat Makeenok |
Imperi Rus |
Imperial Army Air Service |
8 |
Cross of Saint George, Order of Saint Vladimir, Order of Saint Stanilas, Order of Saint Anne |
| Reginald Malcolm |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| George Marks |
Canada |
Royal Naval Air Service, Royal Air Force |
8 |
|
| Andre Martenot De Cordou |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre, Belgian Croix de Guerre |
| Robert Massenet-Royer de Marancour |
França |
Aéronautique Militaire |
8 |
Officier of Legion d'Honneur, Croix de Guerre |
| Ernest Masters |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
French Croix de Guerre |
| M. B. Mather |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Conduct medal |
| Hugh Maund |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
|
| John McCudden |
Regne Unit |
Royal Flying Corps |
8 |
Military Cross |
| James McDonald |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Roderick McDonald |
Canada |
Royal Naval Air Service, Royal Air Force |
8 |
|
| Henry Meintjes |
Sud-àfrica |
Royal Flying Corps, Royal Air Force, South African Air Force |
8 |
Military Cross, Air Force Cross |
| James Meissner |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, French Croix de Guerre. Postwar commander Alabama National Guard. |
| Alexander W. Merchant |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Karl Meyer |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Leslie Mitchell |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Kurt Adolf Monnington |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Henry Moody |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Keith K. Muspratt |
Regne Unit |
Royal Flying Corps |
8 |
Military Cross |
| Thomas Nash |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Flying Cross with Bar |
| Gastone Novelli |
Itàlia |
Corpo Aeronautico Militare |
8 |
1 Gold, 2 Silver, and 1 Bronze awards of Medal for Military Valor |
| Luigi Olivari |
Itàlia |
Corpo Aeronautico Militare |
8 |
4 Silver and 2 Bronze awards of Medal for Military Valor, French Croix de Guerre |
| Eric Olivier |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| William O'Toole |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Otto Parschau |
Germany |
Luftstreitkräfte |
8 |
Pour le Merite, Royal House Order of Hohenzollern, Iron Cross |
| Edwin C. Parsons |
United States |
US Army Air Service |
8 |
French Medaille Militaire and Croix de Guerre, Belgian Order of Leopold II and Croix de Guerre. Admiral during WW II. |
| Eric Pashley |
Regne Unit |
Royal Flying Corps |
8 |
|
| Arthur Peck |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Service Order, Military Cross with Bar |
| Edmond Pillon |
França |
Aéronautique Militaire |
8 |
Medaille Militaire, Croix de Guerre |
| Friedrich Poeschke |
Germany |
Luftstreitkräfte |
8 |
|
| Roger Poupon |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Croix de Guerre |
| Philip B. Prothero |
Regne Unit |
Royal Flying Corps |
8 |
|
| John Quested |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross, French Croix de Guerre |
| Lionel Rees |
Regne Unit |
Royal Flying Corps |
8 |
Victoria Cross, Order of the British Empire, Military Cross, Air Force Cross |
| Wolfram Freiherr von Richthofen |
Germany |
Luftstreitkräfte |
8 |
Iron Cross. Rose to Generalfeldmarschall during WW II. |
| Claus Reimer |
Germany |
Luftstreitkräfte |
8 |
|
| Karl Ritscherle |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Charles Robson |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| William Rooper |
Regne Unit |
Royal Flying Corps |
8 |
Belgian Croix de Guerre |
| Alexander Roulstone |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Richard Runge |
Germany |
Luftstreitkräfte |
8 |
|
| William J. Rutherford |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
|
| Harold Satchell |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Franklin Saunders |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross with Bar |
| Paul Sauvage |
França |
Aéronautique Militaire |
8 |
Medaille Militaire, Croix de Guerre |
| Karl Scharon |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Hans Schilling |
Germany |
Luftstreitkräfte |
8 |
Royal House Order of Hohenzollern |
| Viktor Schobinger |
Germany |
Luftstreitkräfte |
8 |
Royal House Order of Hohenzollern, Iron Cross |
| Carl-August von Schoenebeck |
Germany |
Luftstreitkräfte |
8 |
Royal House Order of Hohenzollern, Iron Cross.
Generalmajor during WW II.
|
| Owen Scholte |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Wilhelm Schwartz |
Germany |
Luftstreitkräfte |
8 |
|
| Walter Scott |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
|
| Herbert Sellars |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| John Sharman |
Canada |
Royal Naval Air Service |
8 |
Distinguished Service Cross with Bar, French Croix de Guerre |
| Walter Simon |
United States |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross. First American ace in a single sortie. |
| George Simpson |
Austràlia |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Service Cross |
| Robert Sloley |
Sud-àfrica |
Royal Flying Corps |
8 |
|
| John Henry Smith |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
|
| Langley Smith |
Canada |
Royal Naval Air Service |
8 |
Distinguished Service Cross, Belgian Order of the Crown and Croix de Guerre |
| William Watson Smith |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Bertram Smyth |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Martinus Stenseth |
United States |
US Army Air Service |
8 |
Distinguished Service Cross. Rose to Brigadier General. |
| John Summers |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Military Cross |
| Leslie Sutherland |
Austràlia |
Australian Flying Corps, Royal Australian Air Force |
8 |
Military Cross, Distinguished Conduct Medal |
| Alexander Tahy |
Imperi Austrohongarès |
Luftfahrtruppen |
8 |
Military Merit Cross, Medal for Bravery, Military Merit Medal (silver and bronze) |
| Fritz Thiede |
Germany |
Luftstreitkräfte |
8 |
Iron Cross |
| Clifford Tolman |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| Thomas Traill |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross. Became Vice Air Marshal before 1954 retirement. |
| Del Vial |
França |
Aéronautique Militaire |
8 |
Legion d'Honneur, Medaille Militaire, Croix de Guerre |
| Alexander Vlasto |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
|
| John Warner |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| Leslie Warren |
Regne Unit |
Royal Naval Air Service, Royal Air Force |
8 |
Distinguished Flying Cross |
| Wilbert White |
United States |
US Army Air Service |
8 |
Distinguished Service Cross, French Croix de Guerre |
| Claude Melnot Wilson |
Canada |
Royal Flying Corps, Royal Air Force |
8 |
Distinguished Flying Cross |
| William Wright |
Regne Unit |
Royal Flying Corps, Royal Air Force |
8 |
Air Force Cross, Belgian Order of the Crown and Croix de Guerre |
| Wilhelm Zorn |
Germany |
Luftstreitkräfte |
8 |
|