A few of mine..
Av gas
Hydraulic oil
Exhaust from a big radial coming to life..don't get to experience that much anymore.
Lingering humidity after a rain
Rubber smell of aircraft tires
4th of July
Many more but the most prized is the smell of perfume laced letters my then to be wife sent me almost daily for two deployments.
I'm pretty sure these would be part of my late father's answer. He spent a lot of time in and around PBM's during WWII.
