The teen, a US citizen, was flying by himself from Panama City, Panama, to San Francisco and appeared to be in emotional distress during the flight, said San Francisco Airport spokesman Doug Yakel yesterday.
An airfield construction crew working nearby confronted the boy and held him until police arrived and arrested him. He was not injured, Yakel said.
Passengers said the teen seemed fidgety and anxious throughout the flight that he acted so quickly, no one had a chance to stop him.
"It was as if he was like flying out, like it was really fast," Gibson told San Jose television station KNTV.
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Matt Crowder, of Atherton, said people sitting near the exit row stood up when the boy jumped out and started to shout.
"They were yelling, 'Tell the flight attendants. Relay the message back. The door's open. Someone jumped off,'" Crowder told the television station. "It was pretty crazy."
The Panama-based airline said in a brief statement that a crew member on Copa Airlines Flight 208 closed the door and the plane then taxied to the gate, where all the other passengers got off the flight without incident.
"They put one of the stewardesses to block it so no one would fall out of there or leave," he said. "We were on the runway for about an hour."
No runways or other flights were affected, Yakel said.