1. In 1927 Boeing won one of a handful of US Post Office Department Airmail contracts

2. The United States Post Office Department (USPOD) implemented postal zones for numerous large cities in 1943.

3. On May 15, 1918, the Post Office Department began Airmail service between New York and Washington, D.C., via Philadelphia — the nation’s first regularly scheduled Airmail route

4. His request ended up in the airmail file of the Post Office Department, and Austin Airways was eventually awarded a contract for the region in 1944.