Ah, springtime. And I think it finally stopped snowing. As the white stuff melts, puddles, and sublimates from airport operation areas, airplanes will emerge from their T-hangar hibernations and start sniffing the sky on sunny weekends. In preparation for these first flights of 2018, on March 13, 2018, the FAA conveniently published the perfect spring tune-up for pilots, Advisory Circular 90-66B. Non-Towered Flight Operations.