There's no one on 2-8 Right but you !
T-00s AC759: "Tower, just want to confirm. This is Air Canada 759. We see lights on the runway there. Across the runway. Can you confirm are we cleared to land?"
T-08s SFO TOWER: "Confirmed cleared to land. Runway 28 Right. There's no one on 2-8 Right but you."
T-16s "Where's this guy going? He's on the taxiway," the other pilot said.
T-20s SFO TOWER: "Air Canada, go around."
T-22s AC759: "Going around. Air Canada 759."
T-23s SFO TOWER: Air Canada looks like you were lined up for Charlie there. Fly heading 280. Climb maintain 3,000."
T- 29s AC759: "Heading 2-8-0, 3,000 Air Canada 759."
T- 33s UA001 PILOT: "United One, Air Canada just flew directly over us."
T -42s SFO TOWER: "Yeah, I saw that."
From G/A instruction to 'they flew over us' => 13 seconds
Now remove from the equation: AC759 reaction time to initiate G/A + engine spool-up (inertia) + UA001 pilot reaction time to report the low pass...