A tipster sends word:
"My husband, who flies weekly from Chicago to Orange County, CA on United Airlines, reports that the in-flight movie for Chicago to the West Coast for the first half of September will be Harry Potter and the Prisoner of Azkaban! Not bad... it'll be out of most theaters by then, and the DVD is months away.
And it's free (sort of)! No DVD extras though..."
Good thing they aren't flying over Hogwarts, or they might run into some unexpected turbulence.
The DVD (with extras) will be available November 23. Airlines frequently show new(er) movies that have just left the theaters but are not available elsewhere.