By Jack Nicas and Susan Carey 

A 16-year-old California boy emerged virtually unharmed after spending a flight to Hawaii hidden in an airplane wheel well, authorities said, in an extraordinary case of survival for a usually fatal type of stowaway.

The boy ran away from his Santa Clara, Calif., home on Sunday, scaled the fence at San Jose International Airport and climbed into the landing-gear compartment of a Hawaiian Airlines Boeing 767-300 that departed for Maui just after 8 a.m. local time, said Federal Bureau of Investigation Special Agent Tom Simon.

The plane reached 38,000 feet during flight over the Pacific Ocean, which lasted five hours and 15 minutes, according to flight-tracking website FlightAware.com. The standard temperature at 38,000 feet is minus 78 degrees Fahrenheit, according to a Federal Aviation Administration report.

Mr. Simon said at least one person witnessed the boy climb down from the aircraft wheel well about an hour after the plane landed at Kahului Airport. Authorities interviewed the boy, who said he had lost consciousness shortly after takeoff. The FBI checked surveillance footage in San Jose, which showed the boy scaling the airport fence Sunday morning.

Mr. Simon said the boy had no injuries. "He did not look like he had been to hell and back," he said. "He was disoriented and hungry."

Attempts to stow away on commercial jets generally originate in the developing world, and usually result in death because of extreme cold and lack of oxygen at high altitudes, as well as the risk of falling when landing-gear compartments open before arrival.

The FAA said that 25 of the 105 people who have stowed away on planes have survived since the first recorded incident in 1929. No such stowaways originated in the U.S. from 1972 until 2010, when a 16-year-old boy hid in the wheel well of a US Airways flight from Charlotte, N.C., to Boston. The boy fell from the plane and died as it lowered its wheels before landing.

That incident, and the latest one, have prompted concern about security. Rep. Eric Swalwell (D., Calif.), who represents part of the Bay Area, said he and fellow members of the House Homeland Security Committee are drafting a request to the Government Accountability Office to audit airport-perimeter security.

"If a teenager who does not appear to have any nefarious intent can find himself onto a tarmac and into an airliner, I am concerned about a more sophisticated plotting individual and what [terrorists] could do," he said in an interview.

Jeff Price, an aviation-security professor at Metropolitan State University of Denver, said the industry has long recognized stowaways as a security threat, however remote, but no terrorist is known to have attempted to exploit the gap. "It's one of those weird situations that until it happens, no one's going to do a lot about it," he said.

Local officials generally are responsible for airport perimeter security, but federal authorities have scrutinized the issue. The FAA report said its work with federal security personnel to monitor and augment airport security is one reason that there were no stowaways originating from U.S. airports from 1972 to 2010.

The FAA said airport and airfield security isn't its purview. The Transportation Security Administration said it is investigating with the airport and FBI. San Jose International Airport officials didn't respond to a request for comment.

The last time a stowaway is known to have survived such a journey to a U.S. destination was in 2004, on a flight from the Dominican Republic to Miami, according to news reports. In 2000, a man survived an Air France 747 flight from French Polynesia to Los Angeles, according to Air Safety Week, a trade publication. And in 1999, a Senegalese man survived a flight to France, but died when he attempted to stow away on another flight later that year, according to the publication.

A 2011 FAA report said that in addition to hypothermia and inadequate oxygen, stowaways face risks "such as being crushed in a confined space when the gears retract, falling when the plane is landing, or dying from the heat produced by the engines of the aircraft."

The boy in the Hawaiian Airlines incident is in the custody of child protective services in Hawaii and doesn't face federal criminal charges, said Mr. Simon of the FBI. A police spokesman in San Jose declined to comment if authorities there planned to charge the boy.

Hawaiian Airlines said in an email on Monday: "Our primary concern now is for the well-being of the boy, who is exceptionally lucky to have survived."

Write to Jack Nicas at jack.nicas@wsj.com and Susan Carey at susan.carey@wsj.com

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