Full FAA Chronology at this link.
19630426: A split occurred within the Air Line Pilots Association, resulting in the formation of a separate union, the Allied Pilots Association, that gained the right to represent the pilots of American Airlines.
19710426: Intercom noted that Ruth M. Dennis would become the first woman to serve as chief of a Flight Service Station when she reported to the San Diego FSS during the week. Dennis had joined the Civil Aeronautics Authority in 1944.
19740426: FAA began an in-depth inspection of the worldwide flight operations of Pan American World Airways following the April 22 crash of a Pan Am Boeing 707