After watching this again, from an original film copy, I was most impressed by the technical special effects by Albert Whitlock. The story is mostly drama, with the actual flight around 40 minutes into the film. The plane appears again later on. I was really impressed by the plane in flight. I couldn't tell it was a model. And the sound effects it made were very impressive. In the plot, there may be someone on the team who isn't who he seems. Very thrilling end to the film. Highly recommend.