KV) 1972 AUSTRIA, COMMEMORATIVE COVER OF THE FIRST AUSTRIAN AIRLINES DC-9 FLIGHT SALZBURG–ZURICH, DE

KV) 1972 AUSTRIA, COMMEMORATIVE COVER OF THE FIRST AUSTRIAN AIRLINES DC-9 FLIGHT SALZBURG–ZURICH, DEPARTS SALZBURG AND GOES TO ZURICH, SWITZERLAND, WITH A SALZBURG COMMEMORATIVE POSTMARK DATED 2.I.72 ON THE FRONT AND ARRIVAL POSTMARK ZURICH 2.I.72 ON THE BACK.