hey im making advances to scrach build a city 4 a spanish project and need advice to build a military air base next to a race trak

In what scale?
Theres no way the runway or airport buildings would be near the race track. It would need to be a huge dio to hold both or even elements of both. To have both together, would seem á bit unrealistic. I suggest you make some drawings of what you are aiming for first. To scale if possible... this is a good way to see if it would work.

Hey Plastic you should see what passes for city planning here!

Panzerschrek, weird project... sure it's not town-planning or something?