Can anybody explain, or refer me to a website that can break down the codes for taxes and fees on airline tickets? Specifically, the following:

Q $80.00
YQ $140.00
YC $5.00
XA $5.00
XY $7.00
AY $2.50
Total: $239.50

I had recently booked an international award ticket, and the "taxes" seemed quite excessive; much higher than taxes on a paid ticket in the past on another carrier, and even higher yet (about 10x) than a current award ticket to the same international destination with another carrier.

The airline simply refers to them as "taxes", but I think in reality there are some fees and/or surcharges rolled in too. When I asked the reservationist for a breakdown however, he could only give me the codes mentioned above.

I realize there could be some fees and surcharges rolled in with these taxes, and different airline policies could be at play on things like whether a fuel surcharge is imposed on an award ticket, or not. But I also have to wonder if some tax laws are being misinterpreted, and I'm being charged certain taxes that are not applicable on a free ticket.

Again, I think a start on unraveling this is if anyone can help decode the designations above.

Thanks!