Macau, Air mail. Air mail Macau-San Francisco 23/4 1937 with five different destinations: Hawai, Guam, Hong Kong and Manila. All five covers with violet cachet "PRIMEIRO VÔO CORREIO TRANS-PACIFIC MACAU-U.S.A.". All with arrival cancellations on back of covers. The entire lot is presented at www.philea.se. (5) (Image1)