[ROSOBORONEXPORTCORP]

Mate.. There are no FM/DM changes to existing aircraft in the game and its non negotiable.. It's been kept that way for a very important reason..
The only changes to FM are to be for aircraft in new slots.. thats just the way it is.

I think a lot of us are missing the point here: You can't improve high altitude performance by editing the individual aircraft flight models. You would have to write a new flight model engine.

Il-2's calculations break down above 25,000 feet or so. That is why there is a hard limit and it effects all flight models.

This limit can be breached ballistically though: If you use a rocket fighter at new maximum altitude, achieve high speed level flight, enter into a short dive and then pull up into a steep climb. If you do this once you can start a series of repeated dives and climbs (like a yo-yo) and keep building up energy. Eventually you start skipping off the atmosphere. One guy was able to climb to 299,000 feet this way.