Travelore News Update: Welcome Below Onboard British Airways: One Dead One Critically Injured

Welcome on board British Airways - or better welcome below on board. Two stowaways tried to get from Johannesburg to London. One is dead, the other in critical condition in a London hospital.

The body of the dead stowaway was found on Friday morning on the roof of an internet company headquarters in Richmond, in West London, below the flight path of a British Airways plane arriving from Johannesburg, South African . The 9,000 kilometer (5600 mile) flight from Johannesburg to London takes 11 hours.

UK police say they know the identity of the 24-year-old survivor, but are awaiting confirmation from South African authorities. Police said that there was “no evidence” linking the two men, but said they were examining their connection as “one line of inquiry.”

Just over 100 attempts to catch a flight by hiding in a plane’s wheel well or undercarriage have been documented since 1945. According to the Federal Aviation Authority, three-quarters of those who try fail to complete the journey alive, particularly if situated in the wheel itself.

Travelore News: Stowaway Found Dead After Falling From British Airways Plane In London

(CNN)A stowaway on a British Airways jet was found dead after falling on a roof as the plane approached London Heathrow Airport, authorities said Friday.

It's unclear whether the man had crouched in the wheel well, a common hiding place for stowaways.

A second man who was hiding in the undercarriage of the plane was hospitalized with injuries, the airline said.

The plane was flying from Johannesburg to London when the man fell Thursday and landed above a business in Richmond, southwest London. Johannesburg and London are about 6,000 miles apart, and the flight is nearly 12 hours long.

The airline tracking website FlightAware.com lists British Airways Flight 54 as a Boeing 747 that departed Johannesburg on Thursday night and arrived at Heathrow at 7:26 a.m. London time Friday.

In a statement, Metropolitan Police said an investigation is underway, and British Airways said it's working with authorities in both nations to get more details.

Plenty of people have hitched a ride on a plane by holing up in a wheel well. Most don't survive.

In April last year, a 15-year-old boy sneaked into the wheel well of a Boeing 767 and flew from San Jose, California, to Maui, Hawaii. He survived.

In February of the same year, crews at Dulles International Airport in suburban Washington found the body of a man inside the wheel well of an Airbus A340 operated by South African Airways.

It's not difficult to climb inside a wheel well, Jose Guillen, a ground operations coordinator at Chicago's O'Hare International Airport, said last year.

"You can grab onto the struts and landing gear assembly kind of like a ladder," he said. "And you just jump on the tire and climb into the wheel well."

But after takeoff, many scenarios could kill a stowaway hiding in the landing gear wheel well.

Inside, there's not much room -- even less than in the trunk of a car, Guillen said.

A stowaway would need to guess where the tire is going to fold in when it closes after takeoff, he said. Otherwise, there's a high risk of getting crushed once the gear starts going in.

This issue of stowaways making it aboard flights has raised questions about airport security.

CNN's Richard Greene and Thom Patterson contributed to this report.