| 1. | In prior years, airspace has been limited to military and air mail services.
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| 2. | Then, in 1918, regular air mail service to Grant Park began.
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| 3. | By 1920, the Air Mail service had delivered 49 million letters.
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| 4. | Throughout this time, Upton Airport received the first air mail service in Canada.
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| 5. | The " Maiden Detroit " entered Contract Air Mail service on February 15, 1926.
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| 6. | Lindbergh used his fame to promote air mail service.
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| 7. | Blackpool and West Coast Air Services resumed the air mail service from February to October 1935.
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| 8. | They were running an air mail service from Maisoncelle to the steamer to cross the Channel.
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| 9. | The airline operated air mail services subsidised by the Australian government, linking railheads in western Queensland.
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| 10. | *1934 closely regulates the contracting of air mail services and prohibits aircraft manufacturers from owning airlines.
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