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Show AIR MAIL MUST ''; BE MAEKED IN-TESTING IN-TESTING PERIOD With the establishment Tueeday of a t-dy trial pec-tod in which the air mall aervlce) wilt experiment with all-night flying on the ao-hour schedule beren New York and San Kranctseo, only such wta.il aa la danated "By Air Mall." will b ao carried, Poatmaster Halph Guth-rla Guth-rla announced today. Durlna (ha trial period remilar air mall schedule will b suspended, but will be restored on Sunday. Under tha refuser echedule all flrat class mall la tram ported by air mall without any roqueet on tha part of senders. When tha nlsrht achadula la rejrularly eetabllshed. , special rharfee wM b mad for thla service, the regular serYtce continuing; continu-ing; to carry tha uaual flrat clsss. During- tha trials; on night flying, however, no special charge will ba mtdt, but no letters will ba ao car-rled car-rled unless apaclal request la marked on tha envelope. |