If you're a Qatari prince, $400m is trivial. If anyone would give a genuinely free jet, they would.
That being said, this one is not a gift. It's manipulation. Stroke Trump's ego and pretend you like him and he'll do whatever you want, as long as you make him think it's his idea.
Its why he us such a bitch about it too. All angsty on his fancy bbs. This is a thing that should never die. Like a rash that wont go away. President 747
Qatar is not Saudi Arabia. Way to drive the point that you can't tell Arabs apart. Also Qatar is merely paying tributes and concessions, also bailing out Boeing.