American transcontinental airmail service begins. The route between San Francisco and Mineola, N.Y., is flown in 14 segments by pilots flying US-built de Havilland DH-4s. The first flight, made mostly in bad weather, takes 33 hours, 20 minutes.
The Guardians of the 11th Space Warning Squadron were honored as the top U.S. Space Force unit for 2024 for their role in thwarting Iranian missile barrages last year.