Domestic.Five cents for the first ounce or fraction and ten cents for each additional ounce or fraction thereof, fully prepaid; such charge includes transportation to or from the Air Mail route as well as transportation by air.
Canada.Same as Domestic.
Foreign.Regular rate of postage plus 4 cents for the first ounce or fraction and 8 cents for each additional ounce or fraction.
Registry Service.Any mailable matter for dispatch by Air Mail, will be accepted for registration.
Special Delivery The use of special delivery stamps in addition to the Air Mail postage will insure prompt delivery at office of address.
Special Air Mail Stamps are issued, but any stamps good for postage may be used.
Indorsement.All mail matter intended for dispatch “Via Air Mail” should be indorsed with those words to avoid possible errors in handling and dispatch.