United Air Lines Mainliner 300

Please address and return to POST UNITED CARD stewardess who AIR LINES will stamp and mail for you.. Majestic, sleek, and cruising at speeds of miles a minute, United Air Lines' 4-engine Main- liner 300s offer unprecedented comfort and luxury aloft. Constant temperature and "altitude'' con trol in the pressurized cabin presents enjoyable low altitude comfort during smooth, high altitude flights. H-4 PRINTED IN U.S.A. FROM UNITED AIRLINES KODACHROME