This is not a war movie neither is it a movie about air combat, its a movie about the racial segregation of the US Armed Forces which were segregated iirc up to the Korean War and the last Black unit was disbanded around 1954.
Why they choosed the Tuskegee Airmen i dont know, they could have choosed any other Unit which was tagged "colored" like the
761st Tank Battailon or a single Person like
Dorie Miller or
Corporal Freddie Stowers.