Indiana Jones and the Last Crusade - Zeppeliner in 1938
When Indy jr. and Indy sr. are about to take a ride in the Zeppeliner, I thought, thats not possible in 1938, because of Hindenburgs crash in 1937, they stopped flying with Zeppeliners instantly after that crash.
it seems that after the hindenburg went down they built one more zepplin called the Graf Zepplin II in 1938 (i think ive actually heard of it)and it ran for 2 years. heres a sight i found regarding the zepplins.
http://www.centennialofflight.gov/essay/Lighter_than_air/zeppelin/LTA8.htm
since this movie takes place in 1938 its perfectly possible to fly a zepplin.