Last summer, I was on DL118 from JFK to CDG with scheduled departure at 5:40 PM. I boarded around 5:15, but because of thunderstorms in the area and the massive cluster$&!# that is DL at JFK, we couldn't push back from the gate until 6:30. Once we did, we taxiied out to runway 13R where they were lining airplanes up to shut down, and we did for about an hour. Then we re-started one engine, taxiied around the airport for another hour and a half and we finally took off around 10:30, about a 5 hour delay. About five days later, without any notice, I found a 20K deposit of skymiles in my account. At the time I was non-elite, so this was quite a surprise. I later received a letter in the mail apologizing for the "disruption of service" and informing me that all of the New York customers were affected adversely that night.
Long story short, write and see what you get. Even for non-elites, they might still give you some form of compensation.
Ah, JFK in the summertime...