Conversation so far:
How did Arnold Palmer become a pilot?
Palmer's early "fear of flying" was what led him to pursue his pilot certificate.
Did Arnold palmer get over his fear of flying?
After almost 55 years, he logged nearly 20,000 hours of flight time in various aircraft.
What year did he get his pilot's license?
CANNOTANSWER.
Did Palmer get any recognition (awards) for his work flying?
On Palmer's 70th birthday in 1999, Westmoreland County Airport in Latrobe was renamed Arnold Palmer Regional Airport in his honor.
Did Arnold Palmer fly commercial flights, or flights in the military?
CANNOTANSWER.

Question: For how long did arnold palmer have his pilot's license?
Self-contained rewrite: Until when did Arnold Palmer have a pilot's license for flying?