Brattle Loop
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FR24 shows that AS389 was taking off on 22L at the time UA688 went around. There's also the ATC recording available - scroll to minute 22 or so. Based on that I *think* they were trying to get AS389 out first, but either timed it poorly or the Alaska crew didn't expedite. But the ATC quality is poor enough that they could have meant after the UA flight landed. Go arounds happen everyday at every major airport; it's functionally routine - but it'll be up to the FAA to decide if it ever got inside the bubble that defines an actual incursion. (Also, note that 400ft was its lowest point of decent; it passed above government center at about 1400.)
The controller talking to the Alaska flight clearly anticipated getting AS389 out ahead of the United landing. That "no delay on the roll" language is common when they're trying to move them in tight timeframes (and it sounded like he said it again to Alaska). Still could be the case that they tried to send it out in too narrow a window, but it's hard to say from the recording. But the controller for AS389 clearly intended for it to depart before the United.