Is it possible to get a 15 year or even a 20 year loan on a 30 yo
plane?

I just gotta ask. Why would you want a 15-20 loan on a 30 yr aircraft?
The interest alone would darn near double the cost of the aircraft.
Thats not even mentioning the stress of having what adds up to
a second mortgage.
Just on a $40,000 loan at 7% your going to be spending approx $300 a
month
on interest alone. Depending on where you fly out of that can be 3-4
hours of
flying a rented airplane per month not to mention the principle
payment.
I agree with buying an aircraft but a15 year loan would scare me.
Lou