I can't tell you what you should do, but I can easily tell you what not to do in your case.

Never finance a depreciating asset.

Whatever you do, do not sell your home to finance anything, unless there is so much equity sitting in it you can:

1) pay cash for another home you KNOW you will like/enjoy (read: no note/mortgage)

and THEN

2) purchase what you want (in your case, flight training) in cash (never, EVER finance anything except a home)

3) DO NOT PERFORM THE ABOVE IN REVERSE ORDER unless you have truly excellent financial discipline. (reread that)