the carrying of mail by airplane or other airship.  This service, provided for a fee, originated in 1918.  Since 1977 no separate fee has been charged for <#domestic> air mail service.

a postal facility located at an air mail field.  Frequently the abbreviation AMF appears in <#postmark=postmarks> applied at such facilities.

a <#postalcard=postal card> intended to be sent by <#airmail=air mail>.  <#scott=Scott> numbers begin with UXC.

privately printed stamps issued for a balloon flight in 1877 and an airplane flight in 1911.  see <#buffballoon=Buffalo Balloon> and <#rodgers=Rodgers Aerial Post>.  <#scott=Scott> numbers are prefixed with CL.

a <#stamp> that pays the fee both for <#airmail=air mail> and <#sd=special delivery>.  Although the first two air mail stamps of 1918 also provided for <#sd=special delivery> service, they are not generally included in the category of Air Mail Special Delivery Stamps.  <#scott=Scott> numbers for air mail special delivery stamps begin with CE.