A

Colombia
A overprinted on stamps of Colombia: airmail stamp for Avianca airlines. These are often listed with the normal airmails being the normal airmails of the period.

 File:Colombia Avianca AA.webp|Colombia airmail for carriage by Avianca airlines File:Colombia Fancy A 40c.jpg|Another series similarly overprinted 

United States
A was the coded 15c domestic first class rate beginning in May 1978. This was done since the stamps had to be printed well in advance of the rate change and the exact rate was not known at the time.  File:US Astamp.jpg|this also exists in coil and booklet stamp versions 

A has been used by other countries as a rate code.

[[Category:A]]