Yes its tuff. I see you had family wiyth you. But I would suggest try getting to the fence. ;)

Ive been shooting airshows and aviation in general for coming up on 25 years.   It's teqnique most of it, but also experience and research.  Before going to an airshow I watch videos of the especially the high speed preformers.   The warbirds are easy to predict.  and they don't move all that fast.

I find my working focal range is in the 200-600mm range and I use both full frame and crop sensor bodys from Canon.  I also use Canon L series glass exclusively .   Shutterspeed varies, but for jets 1/1000th or faster.   for warbirds 1/1000 or slower. If you want a blurry prop , good luck, that's really hard. But worth it , it demands slow shutter speed and a perfect panning technique.    For training , go to an airport , find a good spot and shoot airliners.  they move slower but still good for training.  Another one if you like birds, they are exelent for shooting small fast moving objects, and would be a similar technique to shooting fast moving jets.