homesick angel
n. Pilot's term for an airplane that climbs faster than expected.

Example Citation:
"On the transcript, a comment from TWA Captain Steven Snyder six minutes before the explosion appeared intriguing and a little eerie. 'Seems like a homesick angel here,' Capt. Snyder said, using pilot lingo to say the plane was climbing faster than normal."
—Associated Press, "Flight 800 climbed like a 'homesick angel'"