Lt French says he has been flying along like Sky King. "Sky King" did not debut on radio until 1946. That is after World War II.
When Gorman hands over the press clipping, only the headline and first sentence are about French. The rest of the article is about an unrelated business conference, showing the headline was merely pasted over another article.
During the opening sequence, when the Transport / Cargo plane flies over the field, you can see multiple modern vehicles parked along the edge of the landing strip.