1926, Madrid - Manila Flight overprints on definitive stamps of 1906-23, 2c-1p, 12 stamps used on cover from Cebu to Manila, nicely cancelled by Airplane black marking, delivered by US Army Air Service in March 2-4,1927, all appropriate markings and arrival ds, mostly VF, C.v. is over $900 as for stamps off cover, Est. $350-$450 (Image)

1935 (December 2-6), First Flight by China Clipper from Manila to San Francisco via Guam and Hawaii, cover franked by seven stamps, including two air post overprinted values, issued for this flight, all appropriate markings and arrival ds, in addition five Air Mail related items of 1943-59, all are fresh and VF, Est. $100-$150 (Image)