I'm all for it! I have also requested many times about the possibilities of open cockpits in the past

!!
Now, Rowan's BoB was heaven in one aspect, and hell in the other(ooh.. key settings... oooh....).. but in the 'heaven' side, they had a lot of interesting details within the game - opening cockpits and leaning out for visibility was one of them

!
Currently the "O" key is not used in the fighters - I think besides that HTC would feel it 'tedious'

- there's virtually no reason as to why the feature shouldn't be used... it'd be really great in taxiing, or carrier landings, too!
ps) of course, I don't think they should allow open cockpit flying at 25k...