Prince William,25, is an officer in the British Army.
William, the elder son of Prince Charles and late Princess Diana, is having flight training with the Royal Air Force, and flew alone for the first time on Wednesday.
He described the moment above the skies of Lincolnshire, England, as "an amazing feeling, I couldn't believe it".
"God knows how somebody trusted me with an aircraft and my own life," William said of his flight in a propeller-driven trainer.
William's tutor kept him in the dark about the planned solo flight, stepping out of the plane just before takeoff.
"I was doing a few circuits going round and round then Roger my instructor basically turned round and said, 'Right, I'm going to jump out now' and I said 'What, where are you going?"'
"He said, 'You're going on your own..."'
Once airborne, the prince said, "it was fine."
"You just remember your checks and do all the things you've got to do and fly the circuit," he said.
"Then I was watching the runway getting closer and closer and thinking, please, please don't mess this up."