First Flight and Air Mail Events - Lot of 4

4 covers: First Flight Lufthansa LH 691 Sidney - Jakarta - Bombay - Frankfurt, 1976.

Inaugural Flight American Airlines New York - Port Au Prince, 1971.
WIPA 1981, Mongolian Stand: Aeroflot Ulan Bator - Moscow SU 564. Moscow - Vienna SU 261.
20 Years of Air Mail Moscow - Wien, 1979

All in very fine condition.