A United Airlines Boeing 757 carrying 91 passengers and six crew members aborted its landing at San Francisco International Airport on Friday, October 30, then radioed air traffic control with the words “Mayday, Mayday, Mayday, fuel emergency” before circling back and touching down safely roughly 14 minutes later. Nobody was hurt. But the airline and its own flight crew now appear to disagree about what actually happened in the cockpit that morning.
Flight UA1023, operating a Boeing 757-200 with the registration N19117, was flying the transcontinental route from Boston Logan International Airport when it ran into trouble on final approach to Runway 28R, according to Simple Flying. The outlet reports the jet suddenly went around due to an unstable approach, climbing back up before circling for a second attempt. Air traffic control had warned the crew about wake turbulence from a Boeing 787 that had landed just ahead of them, and controllers also reported a slight five-knot tailwind, though the outlet notes it remains unclear whether wind, wake turbulence, or some combination of the two actually triggered the go-around.
A Fuel Call That United Says Wasn't Official
After the go-around, the flight climbed to roughly 5,000 feet and the crew reported 5,200 pounds of fuel remaining, a figure Simple Flying's reporting describes as close to the minimum threshold for a Boeing 757-200. ADS-B data reviewed by the outlet shows the aircraft began climbing at around 75 feet during the aborted landing, and audio of the exchange with air traffic control was provided by a flight follower. The crew can be heard using the word Mayday on that recording.
Here's where the story gets complicated. A United Airlines spokesperson told Simple Flying that the crew did not declare an emergency, even though the recorded transmission includes the Mayday fuel emergency call. The airline's account and the audio of its own flight crew simply don't line up, and Simple Flying's reporting does not resolve which version reflects what actually happened inside the cockpit. What's confirmed on both sides is the passenger count: a United spokesperson put the number at 91 passengers and six crew, and no injuries were reported.
What Mayday Actually Means in the Cockpit
The terminology matters because it carries real operational weight. Pilots can declare minimum fuel to tell air traffic control they can't accept further landing delays, a lesser step than a full emergency call. A Mayday, by contrast, signals that an emergency requires immediate assistance and allows controllers to prioritize that aircraft's landing ahead of others in the pattern. Pilots retain discretion over which call to make, and under FAA rules, US airlines flying domestic routes must carry enough fuel to reach their destination and a required alternate airport, plus 45 more minutes of flying time.
Simple Flying's reporting is careful to note that a fuel emergency call doesn't necessarily mean an aircraft is moments away from actually running dry — it's a procedural trigger to get priority handling, not proof the tanks were nearly empty. UA1023 ultimately landed on Runway 28R, its first approach attempt having come at 11:11 a.m. and its second, successful landing following at 11:24 a.m.
Not an Isolated Week for United
The San Francisco incident followed another United fuel scare by just five days. On October 25, United Flight 1854, flying from Grand Cayman to Houston, declared an emergency after its right main landing gear failed to extend, with the pilots later reporting just 10 to 12 minutes of fuel remaining, according to the same Simple Flying report. Separately, a United flight arriving from Palm Springs was forced to go around at SFO after another aircraft was still clearing the runway, NBC Bay Area reported, though that aircraft landed without incident on its next attempt.
Low-fuel Mayday calls have made headlines well beyond the Bay Area recently. A Boeing 737 carrying 171 people landed in Manchester with about one percent of its fuel remaining after the crew abandoned two landing attempts amid wind-shear warnings and ultimately transmitted a Mayday fuel call, according to the BBC. That aircraft touched down with just 363 kilograms of fuel left, well below its required final reserve of 1,100 kilograms, and an investigation found another go-around likely wouldn't have been possible. A similar scenario played out a year earlier, when a Ryanair flight diverting to Manchester during Storm Amy came within about 10 minutes of running out of fuel and landed with the same 363 kilograms remaining, as The Independent reported; an investigation in that case pointed to a communication breakdown at the airport that delayed the diversion being accepted.
Against that backdrop, the UA1023 episode at SFO ended without injury and with the aircraft safely on the ground. What's left unsettled is the gap between the crew's own radio call and United's public account of it — a discrepancy that, as of this reporting, has not been explained by the airline.
