I tried this in the demo but not in Beginner world.
Once i had a million to spare i bought a cheap plane and tried to sell it. (its actual valua was higher than the selling price).
But when i wanted to sell it I got the message that my company is too young and my purpose is to carry passengers not sell planes.
So...when can you start leasing out or selling aircraft? Becuase in this game things are more serious than in the demo I have not tried to buy an aircraft just to sell or lease it!
It's an anti-cheating measure, and your airline needs to be at least a few months old before you can start selling your planes.
ok, i saw the message, but how many months ? that is the question ;D