Hijack info.
The Pierce County Sheriff wrote on Twitter that the two F15's arrived from Portland within a few minutes of the Q400 taking off.
Distance between PDX and SeaTac is 112nm.
Max advertised speed of the F15 is Mach 2.5 ~ 1,600 knots.
At 1,500 knots it would take 0.074 hours or just over a minute to cover that distance.
Start up + taxi time to take-off would be about 5 minutes, if expedited, if the pilots were sitting in there cockpits when the call came.
My theory is they were standing by with engines running.
pilotfag