Why not include the possibility,at higher Ace status as it was at least for German pilots,to be able to choose our own personal plane? If i remember it was like that back in Red Baron...there are evidences and well documented,of German aces having their own choice mounts,independently from the Jasta pool,Paul Baumer for example,when DRs1 were dismissed for Fokker D VIIs,started using a Pfalz DVII because he preferred the rotative engine.