TABLE III. -- DOMESTIC AIRMAIL
1918-1955
Date Rates
May 15, 1918 (1)................................................................. 24 cents per ounce, of which 10 cents was for special delivery
July 15, 1918....................................................................... 16 cents per ounce and 6 cents each additional ounce, of which 10 cents
   was for special delivery.
Dec. 15, 1918..................................................................... 6 cents per ounce, without special delivery
July 18, 1919...................................................................... 2 cents per ounce. (2)
July 1, 1924....................................................................... 8 cents per ounce, per zone. (3)
July 1, 1925....................................................................... 10 cents per ounce for Government-operated overnight service New
   York to Chicago; 8 cents per ounce daytime zone rate.
Feb 15, 1926..................................................................... Contract air routes:                                      >   plus 5 cents per ounce each
      Under 1000 mi. .. 10 cents per ounce >     airmail zone a part of such
      1000 to 1500 mi.  15 cents per ounce >    zone the mail was carried
      Over 1500 mi.......20 cents per ounce >   airmail routes.
Government routes:
         Daytime zone
           rate.....................8 cents per ounce
         New York to
            Chicago (over-
            night.................10 cents per ounce
Feb. 1, 1927....................................................................... Both contract and Government-operated air routes: 10 cents per half-
    ounce regardless of distance.
Aug. 1, 1928...................................................................... 5 cents first ounce.
10 cents each additional ounce.
July 6, 1932...................................................................... 8 cents first ounce.
13 cents each additional ounce.
July 1, 1934....................................................................... 6 cents per ounce.
Mar. 26, 1944.................................................................. 8 cents per ounce.
Oct. 1, 1946....................................................................... 5 cents per ounce.
Sept. 1, 1948..................................................................... See footnote 4.
Jan. 1, 1949....................................................................... 6 cents per ounce.
4 cents each for airmail postal and post cards. (5)
Dec. 31, 1955 Same rates as 1949.
1.    Service first established 1918.
2  . Not strictly an "airmail rate."  Between July 18, 1919 and July 1, 1924, there was no airmail rate and no
      offer of airmail service.  Some mail, however, was carried by planes at the regular first-class rate of 2 cents
      per ounce.
3.  The zones were: (1) New York-Chicago, (2) Chicago-Cheyenne, (3) Cheyenne-San Francisco.
4.  Prior to 1948, weight and size limits for "airmail" were the same as for first-class mail; beginning Sept.
      1, 1948, matter carried by air weighing 8 ounces or less was classified as "airmail," and over 8 ounces "air-
      parcel post."  See Table IV for Air Parcel Post rates.
5.  Airmail postal and post card service inaugurated Jan 1, 1949.
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