The Federal Aviation Administration has implemented new permanent landing restrictions at San Francisco International Airport effective April 1, 2026, banning side-by-side simultaneous landings on its closely spaced parallel runways. The measure reduces SFO's arrival capacity by one-third (from 54 to 36 flights per hour) and is expected to increase delays, particularly for United and Alaska Airlines, as part of broader safety enhancements following recent runway incursion reviews