Do you remember whether it was an active aircraft (with nav lights on) or was it just parked?
Looks like the Tuesday night's flight from SEA
(normally in by 9:30 PM
) arrived at 3:30AM Wednesday, which probably means the crew were not legal to operate the morning flight to LAX
so it was canceled and it may be that they had a spare aircraft at the field but no free gate.
Just a guess...
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