Does anybody notice that AJ Allmendinger's crash is the first flip with the rear spoiler on the car?

that's because he got hit while he was sliding sideways. He didn't go airborne. Also at Pocono, Kasey's car went up because he was hit. That is not really airborne.

This is a car going airborne, on it's own, with no other cars hitting it:

http://www.youtube.com/watch?v=I9ZBS1LhUx4

Actually cars have been flipping in Nascar since 1949 and they had rear spoilers most of the time since then just the COT didn't but they changed that because the racing was getting stale with the wing as opposed to the spoiler.

Ryan Newman and Elliott Sadler both flipped at Talladega when they had the spoiler before so this question should be reworded as "since bringing back the rear spoiler".

I was expecting a flip during that race the entire afternoon. There was NO way we were going to get through a Halloween race at Talladega without a flip!

I think the flip is more related to speed than to the spoiler at both tracks. You get close to that 200 mph mark and the risk for flips is magnified tremendously.

Both flips were purely mechanical, not started aerodynamically.. The cars were "sent flying".. They didn't take off on their own..