
this is going to sound complicated...
lets say you want to change the aircraft in tutorial 1 to a Piper Cub.
go to your FSX file, open "SimObjects" and open aircraft, Piper_J3Cub, and open the WordPad file called "Aircraft.cfg", and find "title=Piper Cub" at the very top, now find this part
[fltsim.2]
title=Piper Cub Paint2
sim=Piper_J3Cub
model=
panel=
sound=
texture=2
copy the part "Piper Cub Paint2"
now go to your missions folder, tutorials, "tutorial01" and open the WordPad file called "Tutorial01.FLT"
scroll down until you see "[Sim.0] exactly in that format. then delete the "Aircreation582SL Blue". [b]now past the "Piper Cub Paint2" in the place of Aircreation582SL Blue" Sim=Aircreation582SL Blue"
and save your file...now if it made any sense then have fun changing your aircraft...but if not (witch im sure is the case)...well read it again

