Airbrushing white color airliners

What is the best combination of paint brand, air pressure, thinner ratio and # of coats that results in great white look for a comercial airplane? I have tried some combinations but haven´t got the right one yet.

I knew a guy who got spectacular results with just a spray can of Testors flat white and a few coats of clear gloss sprayed over top and a fine sanding and polishing before decals.

Never tried this way. I always satrted with gloss white. I will try. Thanks