Aviation authorities issued a ground stop order for San Francisco International Airport on Sunday, according to a Federal Aviation Administration advisory that offered no explanation for the flight suspension.
The temporary halt prevents all aircraft departures from the California airport, though officials have not disclosed the reason behind the decision. Airport representatives have not yet responded to requests for information about the situation.
The affected airport serves as a major travel hub, processing more than 54 million passengers in 2025 based on facility records. Major airlines operating from the location include United Airlines, Air Canada, American Airlines and several other carriers.
Earlier this year in March, aviation regulators announced plans to implement new safety measures at the airport that would restrict certain landing operations and result in substantial flight delays.
