For example, as noted above the privately produced 5¢ Buffalo balloon stamps were used on June 18, 1877, for a balloon flight from Nashville to Gallatin, Tennessee.
Semi-official airmail stamps are not issued by the postal authority but have official sanction and are sometimes used for local posts, they are more accurately referred to a labels rather than stamps. Several countries, such as Germany, Finland, Russia and the United States, issued special airmail stamps, or overprinted stamps, for the Zeppelin flights that took place in the late 1920s and early 1930s. The error is one of the most well known airmail stamps. One pane of 100 stamps were found to have an invert error, known as the Inverted Jenny, because the airplane image in the centre is inverted relative to the outer frame. The following year, the United States Post Office Department issued the first airmail stamp specifically issued for the purpose while it does not have "airmail" or "air post" printed on it, it illustrates a Curtiss JN-4 airplane. The first postage stamp to be issued for an airmail flight was in May 1917 when Poste italiane overprinted their existing special delivery stamps. Many airmail stamps feature aviation themes that are an area of topical stamp collecting. Specialised catalogues and albums are produced for collectors of airmail stamps and other aerophilatelic items. Airmail items from the early days are expensive due to the popularity of this collecting area. This led to an expansion that includes the collection of covers, and other postal items carried by aircraft.
In the 1920s and 1930s, when many countries issued airmail stamps to publicise their new airmail routes, a new branch of stamp collecting started. Airmail stamps have been issued for extra services, such as registered airmail, express airmail, airmail fieldpost, and even with welfare surcharges. Some other examples are the use of fiscal stamps, telegraph stamps, postage due stamps, and parcel stamps by other countries. Several of the early ones were produced by surcharging other stamps with overprints at first in 1917, Italy used express stamps regular stamps were used by Austria in 1918, Sweden used official stamps in 1920. Four years later an airmail stamp was issued in Italy. The first stamp depicting an aeroplane was a US 20-cent parcel post stamp issued on 1 January 1913 but not intended for airmail duty: the set of 12 showed transportation and delivery methods. 1935 First flight cover from New Zealand to England with three denominations of airmail stamps paying the 2 shilling and 4 pence rate
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