Example full breakdown below for a trip on BA LGW-MCO return in Nov:
Fare (A1):BA LON
ORL OXRCUK9 £42.50
Fare (A2):BA ORL
LON MLXRCGB8 £148.50
Tax:USDA APHIS Fee $5.00
Tax:US Immigration Fee $7.00
Tax:US Customs Fee $5.50
Tax:United Kingdom Air Passengers Duty £40.00
Tax:United Kingdom Passenger Service Charge £10.80
Tax:US International Arrival Tax $15.40
Tax:BA YQ surcharge £223.00
Tax:US International Departure Tax $15.40
Tax:US September 11th Security Fee $2.50
Tax:US Passenger Facility Charge $4.50
Total for 1 adult passenger: £496.30
ITA Software gives this breakdown:
ITA Software: Trip Planner
FW