I was shooting with my Canon 55-250 IS lens, so nothing too special. Its all about positioning at the show, timing the shot and hella cropping.
If you ever get the chance to go to an airshow with an F-22, I'd suggest you drop everything to see it! That thing puts on one of the most impressive displays ever and I don't get tired of seeing it. It specializes in ripping vapor out of the air!
The last few they have had at Maxwell Airforce Base have not included an F-22.
I remember one year, we didn't go to the show, but our house is in the landing path of one of the runways and a B-2 flew over the house for the show!! Crazy stupid quiet!! Never even heard the thing only got lucky because I was outside and spotted it.