Flew IAH to ANC on a paid first class ticket.

The 2 flights segment up were booked in Z I received 150% EQM for the flights... but on the way back.. it says fare class ZH and only gave me 100% EQM... could not find anything on onepass website about this fare class.

Anyone have any idea what that fare class is? Should I call them about it?

After looking at the ticket, it says my flights up were booked in Z and back in A? I can't find any reference to fare class A on their website....