This is from what I gathered so far... can be monitored with DSDPlus from just about anywhere in the metro area with external antenna. Plenty of power output.
Code:
United Airlines DMR
-------------------
Single Channel system
460.675 @ SEA-TAC INTL AIRPORT TERMINAL
FCC ID: WQAZ475
COLOR CODE: 2
TGIDs
-----
10 Ramp Operations
20 Administrative?
GROUP CALL
----------
10, 20 == AIRCRAFT ARRIVAL NOTICES (WILL HEAR IN STEREO)
RADIO IDs
---------
1 OPERATIONS (PRIMARY DISPATCH STATION)
99991
99992
150795
200542
200504
200605
206068