I'd have to see it to give you a for sure answer. Is this a purchased, but yet to be traveled itin? Was there a price change between when you booked it and ultimately ticketed the reservation?

PQ = Price Quote. When a res is booked in sabre, the agent (or aa.com) has to first "sell" the segments, and then price them. When they're priced, the pricing information is then stored to await ticketing.

Now I'm guessing....

Once ticketed at whatever fare, the PQ goes into the history of the PNR.

It's all kind of fuzzy now, even though it wasn't that long ago.