Full FAA Chronology at this link.
19460315: CAA announced the selection of Will Rogers Field, Oklahoma City, Okla., for the location of its new aeronautical center for training and maintenance. The agency immdiately relocated the Standardization Center (Houston), the general aircraft maintenance base for the Midwest, and the Signals Division School, and planned eventually to move all Federal airways schools and similar Agency activities to this central location. Oklahoma City had agreed to build an administration building and two new hangars for CAA’s use.
19470315: CAA established, “in the interest of safety in air commerce,” airport traffic control zones having radii of three or five miles. In addition to cancellations of airport approach zones, the Agency redesignated a large number of civil airways.