Getting OnePass mileage credit for flights operated by America West changes the picture here entirely.

Did you by any chance have any flight irregularities that caused a change to a flight number other then the original e-ticket? If so it almost guarantees that you don't get credited.

You are going to have to mail in the boarding pass to OnePass and expect to wait about 2 months for the credit to post to your account.

I must have about 20 letters in my HP-OnePass file requesting credit for flights since the partnership began in the mid '90's.

Lots of luck, and avoid HP unless you are not in a hurry.