from:
http://www.cnn.com/2005/US/12/19/miami.crash.ap/
"One of its airplanes was hijacked to Cuba in 1974. Since then, the
company has had a policy of not carrying enough fuel to reach Havana."
Now Havana is not that far from Miami. I have a hard time believing
they would be within legal IFR (or even VFR) reserves if they really
take off without enough fuel to reach Havana. I wonder if they were
just saying that to discourage hijackers?