Yesterday I booked 4 NW roundtrip coach award tickets for my brother and his family (MCO-DTW-EWR - 105K miles)and was charged $10 per ticket ($40 total). I assume this is the post 9/11 security fees. There were no other taxes and fees. Last Thursday (6/13) I booked a 15K NW award ticket (PHL-MSP) and was charged $5 taxes and fees. How can one ascertain which taxes and/or fees to "do something about"?