A reader who comments as “Bill” pointed to a possible source of audio from the flight.
Try this site for audio. https://www.liveatc.net/archive.php? KSFO Tower 10:00 UTC. I couldn’t get the archive file to load. But apparently the archives are suppose to be free for 7 days.
Maybe someone else can figure out how to access and then save an audio file. If so, it should shed even more light on the situation.
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I’m not an aviation expert, so please verify the data below before making conclusions.
ADS-B Exchange appears to show the other flight was a CRJ-200 operated by SkyWest as Flight 5974 from Fresno Yosemite International Airport. At about 3:16 pm PDT, United 373 and SkyWest 5974 were both approaching the airport at an altitude of about 1075 feet. It appears United 373 was gaining on the SkyWest, since it was traveling about 24 knots faster. SkyWest was to the front right of the United.
According to the Wikipedia entry for SFO, “aircraft may safely land side-by-side essentially simultaneously on 28L and 28R while maintaining visual separation.”
Here’s a screenshot of the track from ADS-B Exchange:
https://imgur.com/a/uyr92wg
You can view the data at this link, but use an adblocker. You’ll probably want to hit the pause button and reduce the playback speed to 1.2x or so:
https://globe.adsbexchange.com/?replay=2026-03-21-22:16&icao=ad1da9&lat=37.586&lon=-122.300&zoom=14.3