It's included in your airline ticket.... As long as it was purchased since March last year.
To give you an example.. This is the breakdown for my taxes for my trip home and back. These are in Euro's and were included in the ticket price.
U.S. Security Service Fee: 7.36
Argentina Airport Tax: 21.27
Fuel Surcharge: 126.00
Ireland Passenger Service Charge: 7.90
Ireland Pre-inspection Charge: 1.51
U.S. Customs User Fee: 8.08
U.S. Immigration User Fee: 10.28
U.S. APHIS User Fee: 7.34
Argentina Immigration Tax: 7.34
Argentina Security Tax: 1.84
U.S. Passenger Facility Charge: 3.31
Ireland Airport Security Charge: 3.90
LQ: 10.00