The main protagonists of the movie Mannock, Collishaw, Ball, Bishop and McCudden all were named after famous British WW1 Fighter Aces, Trenchard was named after Hugh Montague Trenchard, 1st Viscount Trenchard Bt GCB OM GCVO DSO , who is considered the father of the Royal Air Force.
The German actor Ludger Pistor played the role of Werner Voss, which was also the name of WW1 German fighter ace Werner Voss.
This movie is known by its original title of "St George's Day" and by its alternative English title of "Berlin Job" (as on Netflix and Tubi).
The commemorative date of St George's Day in England each year is 23rd April.
"Berlin Job" is the name given to the recut version (97:24 runtime). "St George's Day" is the uncut version (104:23 PAL or ~108:50 runtimes). Recut version loses the football-fight organsing and ferry scenes, a few Amsterdam scenes, and some conversations extending character relationships.
Tyson Fury makes an appearance as an extra in the posh restaurant scene, early in the film.