3 video guides to help you steamroll over Airforce easily under 5 minutes w/o loads:

GLA Guide (Toxin/Stealth/Demo vs Airforce) -

USA Guide (Laser/Super vs Airforce) -

China Guide (Tank/Nuke/Infantry vs Airforce) -

The video guides were done in hard mode, but work just as well in lower difficulties. In fact the strats can be modified to be potentially faster and cleaner to execute as you start with more economy.