Airmail quickly captured the imagination and interest of people across the country. Suddenly those who had given no previous thought to stamps or cover collecting were eagerly sending mail on any flight of note. Thousands of flights that the 20th century carried specially canceled and designed envelopes. Some created by individuals for a flight, some by entrepreneurs who sold the philatelic materials when the flights were completed.
The National Postal Museum has examples of many notable flights in its collection.
