From SFGate.com:
Federal Aviation Administration spokesman Ian Gregor said that since 1947 there have been 74 known stowaway attempts involving 64 flights worldwide, including Thursday's incident. He said 60 of the 74 people have died, or 80 percent.
(from the same article)
...Other stowaways have narrowly survived the flight, including a man who lived through a flight from Tahiti to Los Angeles in 2000, arriving with a body temperature of 79 degrees. He was later repatriated to Tahiti, though a Cuban man who rode the wheel of a DC-10 to Montreal in 2002 was granted asylum.