Buying additions to FSP airplanes

[Full_Throttle0]

it would be need if you could custimize your default 737-400 with engines from diffrent manufacturs, like more effientcy but with less
speed. or less noise (pax go happy) but less power. as for adding a pressurized system for cessna inreal life you would need to make
sure all doors and windows are airtight. even replace windows so they don't fog.