Oh wow, they even got the “I picked the wrong day to quit smoking” line from Zero Hour.
The rights to the movie were purchased by the makers of Airplane!, and they were able to use the screenplay almost verbatim. The movie is not currently available in VHS however a DVD version was released by Warner Home Video on June 26, 2007. One of its rare public showings was on TV by Turner Classic Movies in a back-to-back showing with Airplane!
(via Andy’s Blog)