"It's like a one in a million chance you're going to survive because of the lack of oxygen and the lack of temperature," said former airline mechanic Doug Hornal.
"It's going to be loud. It's going to be dark and it's going to have very little oxgen to breathe and a person would pass out pretty quickly up there," said airline industry insider Peter Forman.
Experts agree that the teenager who made it from California to Hawaii in the wheel well of a 767 should count his blessings.
"There are examples of people flying at lower altitudes for shorter flights and surviving, but I think this is unprecedented. Somebody surviving this high for this long," said Forman.
Hornal is all too familiar with the mechanics of large aircrafts. He's worked on them for years and says climbing in is relatively easy and there's a lot of space inside -- some 15 feet in height.
But, once the wheels go up, that space goes away.
Someone trapped inside would have to first avoid getting crushed by the moving parts, then hang on.
That's the easy part. Experts say there are shelves that can be used to lay on, pipes to hold on and hydraulic hoses that can provide some heat, but not enough to keep you awake.
"A lot of the people that have done this that have perished, they'll be hanging on. All of a sudden the doors will open or they'll still be unconscious and they'll just fall out and fall to their death," said Hornal.
Luckily, that didn't happen here. But, it did raise security questions like how someone could just hop a fence and hitch a ride.
Following the event, the Transportation Security Administration says it's examining the security at San Jose's airport, where the flight came from.
The Hawaii Department of Transportation says it can't disclose details of its security operations but says it's continually working with security partners and the Federal Aviation Administration to improve operations.
According to the FAA, 105 people are know to have attempted to fly inside wheel wells on 94 flight worldwide since 1947. Of those attempts, 80 people died and 25 survived, which represents a 23.8 percent survival rate. One of the survivors was a 9-year-old child. One of the flights went as high as 39,000 feet.