The FAA publishes Notices To Airmen (NOTAMs). Among other things, these NOTAMs indicate the times and locations where airspace will be restricted due to a "VIP" in the area. If you want to know what time Bush and Dick are coming, the FAA will tell you...
Visit http://www.faa.gov/ for all the latest NOTAMs.
At the moment, this is the link that will tell you what you need to know. It's a page that searches a radius around an airport for NOTAMs. To find Bush and Dick in Portland, type "PDX" as the Location Identifier, and click "View NOTAMs".
If a "VIP" (Very Ignorant Person) is visiting Portland in the near future, you will find in the resulting mess of text the following kinds of entries:
!FDC 4/0285 ZSE WA..FLIGHT RESTRICTIONS SEATTLE, WASHINGTON, JANUARY 13, 2004 LOCAL. PURSUANT TO TITLE 14, SECTION 91.141 OF THE CODE OF FEDERAL REGULATIONS, AIRCRAFT FLIGHT OPERATIONS ARE PROHIBITED WITHIN THE FOLLOWING AREAS UNLESS OTHERWISE AUTHORIZED BY ATC. 3.0 NMR BLW 3000 FEET AGL OF 473148N/1221807W OR THE SEA344005.7 FROM 0401131840 (1040 LOCAL 01/13/04) UNTIL 0401131930 (1130 LOCAL 01/13/04). 3.0 NMR BLW 3000 FEET AGL OF 473646N/1222034W OR THE SEA333010.7 FROM 0401131905 (1105 LOCAL 01/13/04) UNTIL 0401132210 (1410 LOCAL 01/13/04). 3.0 NMR BLW 3000 FEET AGL OF 473148N/1221807W OR THE SEA344005.7 FROM 0401132145 (1345 LOCAL 01/13/04) UNTIL 0401132235 (1435 LOCAL 01/13/04).
!FDC 4/0280 ZSE OR.. FLIGHT RESTRICTIONS PORTLAND, OREGON, JANUARY 13, 2004 LOCAL. PURSUANT TO TITLE 14, SECTION 91.141 OF THE CODE OF FEDERAL REGULATIONS, AIRCRAFT FLIGHT OPERATIONS ARE PROHIBITED WITHIN THE FOLLOWING AREA(S) UNLESS OTHERWISE AUTHORIZED BY ATC. 3.0 NMR BLW 3000 FEET AGL OF 453450N/1223502W OR THE PDX110001.2 FROM 0401132225 (1425 LOCAL 01/13/04) UNTIL 0401140330 (1930 LOCAL 01/13/04),
The key words here are "Title 14, Section 91.141", which is a reference to aeronautical law. Specifically, the bit that says:
91.141 Flight restrictions in the proximity of the Presidential and other parties.
No person may operate an aircraft over or in the vicinity of any area to be visited or traveled by the President, the Vice President, or other public figures contrary to the restrictions established by the Administrator and published in a Notice to Airmen (NOTAM).
So, it looks like somebody (probably Cheney) will be arriving at or after 2:25PM on the 13th, and leaving before or at 7:30PM on the 13th. Cool, huh?