Many movies can be interrupted by a word from the sponsors, and no one's worse off. A League of Their Own was on earlier today, and I was happy to use the commercial breaks to check on my laundry, and still was moved, as always, but that film's end. But United 93 -- sensitive topic aside -- must be viewed continuously. At least in its final stretch. TNT could've run the last 20 minutes commercial-free without detriment to their finances. They did not. They broke for commercial as the passengers readied their first and final mutiny.
It's classless. And clumsy. And it made me feel angry and cheap, like the film's engrossing craftsmanship was exploited to make me stew through commercials. Grumble.
Anyway, you should see the movie continuously and in its entirety. Don't stop and watch it if you catch it on TV. For what it's worth, here is my essay after viewing it for a second and third time on DVD.