HONG KONG 1937,  First flight cover franked w. 35c P1563. tied w. 'Hong Kong 29 Apr. ' to Manila by Pan American Airways "Clipper", special cachet 'First Flight VIA P.A.A. / Received Manila 1937 / from Macau Hong Kong'. With arrival cds on back dated Apr. 27 1937. Cover returned back to to Miss G. Ezra, Hong Kong on May 5, 37 - machine cancel on reserve.