This feature might never have been in the game - when the game was ready to be published a list of key codes he hoped he could get in the game was sent probably at some deadline that included that and other things - for example the braking chute key - but there are no 3D chute models even in the game.
If it was taken out during a beta version then it was causing problems with other things that couldn't be fixed at the time - and was left as non essential.
Looking back at SFP1 - and the many things wrong with it - I'm pretty glad the main things have been dealt with, stability, AI, bouncing planes , etc etc....
At the moment I would hope his priorities are bug fixes in the engine, and producing a new game, which is the only chance of new features, and getting good non stutter performance out of multi core CPUs which have now been around years.
TK really needs to hire a team of programmers to help him - but this could bring in other problems - not least having to pay them all - and could still take years to see any progress.
If I was him I would reduce non essential patches to one every 2 years or during a new game release, and waste less time answering the same question over again on the forums!
Anyone expecting some kind professional customer service from a programmer is dreaming - of course you can always buy something else - theres plenty to choose from
Maybe you can all get Ace Combat 6 and talk to their call centre in India about implementing realistic flight models.