Postage rates on air mail

§ 4303. Postage rates on air mail (a) Except as provided in section 4304 of this title and subsection (b) of this section the rate of postage on domestic air mail weighing not more than eight ounces is seven cents for each ounce or fraction thereof. (b) The rate of postage on each postal card and post card sent as domestic air mail is five cents. (c) The rate of postage on letters in business reply envelopes and on business reply cards sent as domestic air mail is the regular rate prescribed in subsection (a) or (b) together with an additional charge thereon of two cents for each piece weighing two ounces or less and five cents for each piece weighing more than two ounces. The postage and charge shall be collected on delivery. (d) (1) The rates of postage on air parcel post are based on the eight zones established for fourth class mail in accordance with the following table: Zones First pound over 8 ounces or fraction thereof Additional pounds or fraction thereof Cents Cents 1, 2, and 3 60 48 4 66 50 5 70 56 6 76 64 7 75 72 8 80 80 (2) The rate of postage on airmail of the first class weighing in excess of eight ounces shall be the rate provided for air parcels, but in no case shall be less than 3 cents an ounce or fraction thereof. (3) In addition to parcels to which it is otherwise applicable, the eighth zone includes, for purposes of this section only, parcels transported as follows: (A) between the United States, its Territories and possessions or the Commonwealth of Puerto Rico, and the Canal Zone. (B) between the United States, its Territories and possessions or the Commonwealth of Puerto Rico, and Army and Air Forces post offices and naval vessels and commands, when the address is in care of Fleet Post Offices, New York, New York, or San Francisco, California. (e) Air parcel post of light weight in relation to size is subject to such surcharge as the Postmaster General determines to be warranted by reason of the extra space and care required in handling and transporting it.