Does the Departure Fee say Departure Fee on your airline docs?
Here are the items listed on my tickets:
Airfare: 634.00 USD
U.S. Customs User Fee: 5.00
U.S. Immigration User Fee: 7.00
U.S. APHIS User Fee: 5.00
U.S. Federal Transportation Tax: 29.00
U.S. Security Service Fee: 7.50
Belize Airport Development Fee: 15.00
Bellize Conservation Tax: 3.80
Belize Passenger Service Charge: 15.00
U.S. Passenger Facility Charge: 4.50
Belize Security Tax: 2.50
Per Person Total: 728.30
USD