Originally Posted by Duhey2
By "commercial" I assume you mean an airline transport pilot ("ATP"). An ATP rating requires a 1st class medical certificate, a commercial requires at least a 2nd class medical, us private pilots at least a 3rd class, and the new sport pilots need to show their driver's license.
See FARs Part 61.11 & 61.23.
You are of course correct, I got my numbers reversed. I was for some reason thinking of airport approach classifications rather than med certs....