Of course, this is all guesswork at this point, but it almost certainly won't be an '8 hour CAP'. This whole thing will go on all week, regardless of whether Obama and Biden are actually in DC the entire time.
Well, for now, it's an eight hour CAP and out. Of course, things could change as they often do with CAPs. There's one way to find out and that's to keep a watch on the published TFRs for this area. You can't just run a CAP without putting the airspace off limits to other aircraft and that is always done by publishing it. As of this moment, all we have is eight hours of airspace atop the D.C. area that's being restricted. If the train route is to be air protected, that too will be published with air restrictions. Nothing on that front yet.
Brian, there will be a ton of Secret Service communications during that period but it's all encrypted so we won't get to monitor any of it. Perhaps there'll be mentions on some of the D.C. area 380 mHz nets - but where? And, of course, on inauguration day there will be constant craziness on the D.C. MPD trunked systems for those that can hear them in the immediate vicinity of D.C. All the area police departments will be insane because of the traffic. Just the expected 10,000 buses are going to pose a major constriction of the travel lanes on area roads. Where the hell do you park 10,000 buses? Anyway, there will be plenty to hear depending on individual levels of interest in the various systems. There will also be plenty of fluff on the airwaves as media tries to get as close as possible to the events. To each his own, I guess. Personally, I want to hear the CAP and don't much care what the police departments are doing so that's all I'll be tuning to that day unless there is some major incident. Hopefully, that won't take place.
Mark/Travis: I just saw a report on another board with a report/log of Mode-S listening in the D.C. area from 25-28 December. I don't know if it was a visitor or if we have a new member of the local Mode-S club. I don't recognize the email address. I'll try to get in touch with him tomorrow to see if it's someone we know. If either of you saw the report and know who it is, it would be great if we could get him over here.
His report reminded me of something I meant to log here and then forgot. There was a DAWG 04 (C-130H, 80-0323, 158th AS GA-ANG) into Andrews yesterday the 27th. His voice callsign was DAWG 19. He arrived with ADW Tower on 118.4 at 2052. He was in the day before also.