Use 2nd shutter flash.
You can use a longer exposure to expose for the skyline or ambient light and the flash only fires as the shutter is closing meaning the motion is frozen for you. You would then have to be careful re reflection etc but other than that there isn't much of an answer. Well, other than whacking up the ISO and getting noise.
That's my best suggestion anyway, someone else may have a better one.
The Events Team
Airshow volunteer and barrier placement specialist