Because he may really be Batman, pic related
Or just a kind hearted guy, saving a 66 yr old woman's family farm.
http://www.buzzfeed.com/andrewkaczynski/donald-trump-once-saved-a-womans-farm-from-foreclosure#.nsdPgWNaLCommercial airlines refused to fly the child because he could not travel without an elaborate life-support system, which includes a portable oxygen tank, a suction machine, a breathing bag and an adrenaline syringe.
“Mr. Trump did not hesitate when we called him up. He said ‘yes, I’ll send my plane out,’” 29-year-old Harold Ten recalled shortly after he landed here Tuesday morning.
Asked why he thought Trump made his private jet available, Ten replied, “Because he is a good man. He has three children of his own and he knows what being a parent is all about.”
http://www.snopes.com/trump-flies-sick-boy/But I think he really has a Bat Cave.