Hi Andy,great shots ,I too have just bought a D7100 i’m no expert haven’t been doing aviation photograhy for that long but have found that using it in AF-C mode and with 21 or 51 focus points works for me with a Nikkor 70-300mm lens.
Another meat scandal I think! Very nice pictures by the way.I need to do 2 days next year not enough time to look around and watch the show.Did you do the 2days?