I believe there is a Freudian slip in the film. Stewart is supposedly a B-17 pilot who has been recalled to duty. Having seen the B-36, he comments to his wife "I thought the B-24 was big, but this.." I suspect he was meant to say B-17, but in the generated excitement he slips into reality; he was a B-24 driver in WWII. I guess no-one picked it up. If I'm wrong, blame many years since I last saw it. Also off to set the recorder.