During the Cold War, 2 different families escaped over the Berlin Wall using these lighter-than-air vehicles
War II, NACA engineers at the 
Langley Aeronautical Laboratory (now ... production standard of other Grumman 
Wildcats, research on this aircraft, the ... Let us use the story of flight to build a .... 
these intrepid souls suffered broken ... hydrogen, a gas very much lighter than air.