Why didn't the black dude just change seats? Grrrrr!

At the start when they're flying to Bangor and Mr. Twoomy is constantly ripping the paper, the black dude sitting across the aisle from him keeps getting annoyed and threatens to punch him out. Now sure, watching a guy stress out and constantly rip paper would be highly annoying, but bloody hell, there's an entire empty plane at his disposal, so go sit somewhere else. It drove me nuts that he was being driven nuts and didn't just move seats.
For that matter, why are they all still sitting at the back in economy. I'd be straight up in the expensive seats.