I agree with the original poster about the odd plane choices for the first few planes. However, I do agree that there needs to be at least a two-seater in the game to actually make it a _GAME_ as opposed to just an endless chain of furballs which gets old fast. Given that they are only modeling one two-seater, it looks like all planes will be playable by all sides, which is probably as it should be; it ain't historical but if you read history, very rarely did sides in the air war in WWI (and WWII for that matter) have qualitative parity; it was a constant game of oneupsmanship that the Germans eventually lost given their poor access to resources.
Back to the original plane choices, this is just a matter of airing my opinions (since everyone else seems to be indulging one's ego in this matter) sooo...
...instead of the Camel, Tripe and D.VII and Brisfit, I probably would have chosen:
Nieuport 17 (flown by both the French and British - as well as the Italians - and later variants of the Nieuport sesquiplane were flown by the British well into 1918!).
Albatros D. III (probably the most common opponent the Nieuport 17 had during 1917).
Spad VII (also flown by both the French and the British - and the Italians - and soldiered on from '16 into '18 as well...plus, with the Spad VII and the other two planes, you get a nice range of different handling characteristics for air-craft for people to get used to and use).
Fe2b (and now...for something completely different...pretty much a British work-horse when it came to the air war in general...fighter, recce, bomber...it did it all...plus, when well handled, it could survive).