DARWIN ALERT dammit! Has anyone ever seen a story with the headline - "Stowaway Makes Successful Entry in 747 Wheelwell"? I haven't.
The key was that it is only 90 miles to Miami from Cuba so the temps and oxygen deprivation are not as big a problem.
Failure:
http://www.caribbeannetnews.com/2003/12/27/stowaway.htm
Success:
http://faculty.deanza.edu/ifftmaryanne/discuss/msgReader$73?mode=topic