Jay the weather was just starting to clear up right in that area. We endured a heavy rain about an hour before the performance & it was raining (very dark clouds too) to both the east & west during a good part of the performance.
Randy all of these photos are from Saturday. I think they only made one fly by where they crossed paths on Sunday & it only had 3 planes, so I suspect that one of the pilots who normally flew the routine was grounded due to a sick aircraft.
Frank the timing was sheer luck thanks to the buffer size. I simply tried to judge when to hold down the shutter button and in most cases I let go (after seeing them cross) before the buffer filled. Next time I think I'll use my 35-350 L for that little extra bit of reach.