First it kind of depends what you are attempting to do?
If you want to do great in HA level 6 ft 2 scout.
If you want to dominate planes in GB and give sight level 6 ft 2 scout.
If you want to kill planes and sink ships level 5 ft 3 tb/db.
For stats you want the highest you can get in the primary stat for that type i.e.
Fighter = Fighter stat
Bomber = bomber stat
Scout = Aircraft stat
You will also want one Seaman +12 or +13 or +14 in Fighter.
Best sailor is a hero sailor that is +14 in every stat.
Next is elite that is +13 in the primary stat.
Then next is rolled +12's.
Keep in mind that fighters depend alot on Vets and Experts, the more the better.
Also it is recommended in most cases not to class a Fighter pilot past the Fighter promotion. This has to do with the crew growth being more valuable that the small percentage of stat boost.
P.s. There are many different variable's in how you may want to outfit your cv. Know that in the CV6 you will need 8 pilots, 1 Bo and 3 other sailors (one atleast should be seaman)
Hope this helps you.