Corrected entry: Aircraft speeds in the film are frequently given in miles per hour. Airspeed is always measured in knots, and the aviators would certainly use the correct units when talking to one another.
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Correction: At the time of the movie airspeed was measured in statute miles per hour. Not nautical miles per hour, or knot. General aviation planes did not regularly get ASI's (airspeed indicators) until the mid 70's. Traditionally, acrobatic planes still have ASI's that read in statute miles per hour.