A local plane photographer took these two shots last night of the F15s scrambling from PDX as a result of the stolen Q400 in Seattle. (credit to Russell Hill for the amazing pictures – https://twitter.com/Sabian404).

He said the time from initial call to the second plane off the ground was 8 mins. Looks like they were near the other aircraft in another ~6 mins. Lots of reports of supersonic bangs over southern Washington.

I heard them right after take off, as the sound of F15s in full afterburners is distinctive.