Ever since Futurama moved to Sunday nights at 7:00 back in 1999, alt.tv.futurama has been filled with complaints about "we only got to see the last ten minutes because of football". For those of you wondering how it works - especially what happens when Fox doesn't have a doubleheader - allow me to try to explain:
First, if you're wondering which games Fox gets to show and which ones CBS gets to show, it's easy: if the visiting team is NFC, it's Fox, and if it's AFC, it's CBS. (Remember, it's the visiting team that determines the network, not the home team.)
Anyway, when Fox gets an NFL doubleheader, the second game starts at 4:15 Eastern (it used to start at 4:00, but so many of the 1:00 games ran past 4:00 causing the 4:00 games to be joined in progress (or, in the cities where the 4:00 games' teams were playing, to cut away from the end of the 1:00 game) that they moved it to 4:15), and most of the games will run until just before 7:30; Fox will run its post-game show followed by the 7:30 KOTH. (Usually, if it runs past 7:30, Fox will air the episode in progress, so it doesn't mess up anybody who is expecting "The Simpsons" at 8:00 or "Malcolm in the Middle" at 9:00, but if it's a new episode, Fox may show the whole thing and just push the rest of their schedule back a few minutes. There is a point, however, when Fox will decide to run the post-game show to 8:00 and not air that night's KOTH; they did this with "Goodbye Normal Jeans" a couple of years ago.) Even though some cities get only one game on Fox (because either (a) the local team's home game is blacked out, or (b) it is on, but it is on the CBS station, and there's a rule that says the Fox station cannot show a different game at the same time), there is no 7:00 Eastern episode in the Eastern and Central time zones (there is in the Mountain and Pacific).
If it's not a Fox doubleheader, then just about each Fox station decides on its own whether to show a 1:00 Eastern or a 4:05 Eastern game. The stations that show 4:05 Eastern games usually end up showing the 7:00 show in progress, although there have been times when all of the 4:05 games ended early. (This is one of the reasons Fox has not started airing new episodes of "Oliver Beene" on Sundays at 7:00 like they announced yet.) Some stations in cities with NFL teams have to show a 1:00 game, and some have to show a 4:05 game, depending on the game time, network, whether it is a home or away game, and for home games, whether or not it is blacked out.
(Those of us in the Mountain and Pacific time zones get the 7:00 and 7:30 shows at their scheduled time; however, if an NFL game on Fox causes a new 7:30 episode not to be aired in the east, then it will be replaced in the west with a repeat - new episodes are never aired "just in the west".)
Also note that: (a) sometimes there is more than one 4:05/4:15 game on Fox, and yes, they will switch from one game that ends to another that is still on until all of them end, and (b) some cities (I think Boston is one) always shows a local post-game show at 7:00 if there's no game in progress.
Here are the remaining regular season weekends:
11/30 - one game on Fox One game on Fox starting at 4:05 Eastern: New Orleans at Washington
12/7 - one game on Fox One game on Fox starting at 4:05 Eastern: Arizona at San Francisco
12/14 - Fox doubleheader Three games on Fox starting at 4:15 Eastern: Carolina at Arizona, Dallas at Washington, Green Bay at San Diego
12/21 - Fox doubleheader Two games on Fox starting at 4:15 Eastern: Arizona at Seattle, San Francisco at Philadelphia
12/28 - one game on Fox Two games on Fox starting at 4:05 Eastern: Carolina at N.Y. Giants, Minnesota at Arizona
-- Don