Hong Kong. (Philippines). 1937. Air Mail envelope addressed to New York bearing SG 109, 6c orange, SG 117, 1c brown, SG 118, 2c green, SG 118c, 2c grey SG 119, 3c grey, SG 120, 4c carmine (2), SG 121, 5c violet and SG 123, 8c orange tied by Hong Kong date stamp endorsed 'Hong Kong to Manila/ via Trans-Pacific Route' and 'By Airmail/ China Clipper' with circular 'First Flight via P.A.A./From-Macao-Hong-Kong' in violet on face and Manila transit on reverse 'Apr 29' . Attractive franking.