Full FAA Chronology at this link.
19460401: CAA assumed custody from the Army of the files and records relating to instrument approach procedures, and became responsible for processing and approving standardized instrument approach procedures for all civil airports under CAA’s jurisdiction. (See May 1, 1945.)
19460401: Standards for the Control of Instrument Flight Rule Traffic, a manual approved by the operations executives of the Army Air Forces, Navy, Coast Guard, and CAA, became effective. Its adoption recognized the need for common procedures in the control of civil-military air traffic.
19480401: CAA assumed administrative control of the Landing Aids Experimental Station at Arcata, Calif. The station was a joint civil-military,