The boy survived the nearly 3,700-km journey from California-to-Maui over the Pacific Ocean - enduring frigid temperatures, oxygen deprivation and a compartment unfit for human habitation - as he travelled in the jet's wheel well at an altitude of some 38,000 feet.
A report in the Hawaii News Now quoted Maui police sources as saying that the boy ran away and was trying to get to Africa. The boy had been living with his father in Santa Clara, but his mother lives in Somalia.
San Jose airport officials say surveillance video shows a figure cross the tarmac and head towards the plane.
The boy is originally from Africa and told authorities he climbed into the wheel well and hitched a ride, ending up in Kahului, the report said.
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The fact that he survived is both baffling and scary.
He told authorities he passed out shortly after takeoff. Medical experts say the body goes into a state of hibernation when faced with the conditions and few survive.
Temperatures are well below zero degrees. The elevation, 38,000 feet, is higher than the tallest mountain. Oxygen levels quickly drop from 20 per cent on the ground, to 5 per cent in the that altitude. And he survived all this, for five hours.
He was disoriented and had trouble hearing, but other than that, seemed to be unharmed.