Hawaiian Airlines spokeswoman Alison Croyle said airline personnel noticed the boy on the ramp after the flight arrived and immediately notified airport security.
"Our primary concern now is for the well-being of the boy, who is exceptionally lucky to have survived," Croyle said.
Simon said the boy was medically screened and found to be unharmed.
"Doesn't even remember the flight," Simon said. "It's amazing he survived that."
A call and email message to a Mineta San Jose International Airport spokeswoman were not immediately returned. Officials at Kahului Airport referred questions to the State Department of Transportation, which did not return a phone call seeking comment. A Transportation Security Agency spokesman who declined to be named referred questions to the FBI and airport authorities.
The boy will not be charged and was referred to child protective services, Simon said.
- AP