Air letter carried by first flight LH657

The air letter displayed below was carried by the Lufthansa first flight LH657 in 1974.  DC10 jet airliner made its first flight starting at Tokyo, then Anchorage – Hamburg – finally to Frankfurt.  A few copies of Burma air letter sheets were carried onboard and pictorial cachet was applied.  All copies in my hand were philatelic and cancelled at Yangon GPO on 18 Mar 1974.