You are quite right JW411. On my last flight with Pan Am in late 1982 from Frankfurt to New York, I had to help the hostie up the stairs to the 747 "as my knees are giving trouble"! She was older than my mother, poor dear. With regard to the maintenance of the aircraft, there is an air to air shot of the 747 towards the end of the documentary and it shows quite substantial staining at the base of the fin. Not good for a publicity shot I would have thought.