Between US and:
Amsterdam (includes Netherlands Noise Isolation Charge, Security Charge and Passenger Service Charge): $86
Copenhagen (includes Transportation Tax and Passenger Service Charge): $80
Faroe Islands (includes Departure Tax from Faroe Islands): $71
Frankfurt (includes Airport Security Charge and Passenger Service Charge): $85
Glasgow (includes UK Air Passenger Duty and Passenger Service Charge): $106
(Business Class tickets may add additional fees)
Greenland (includes Passenger Service Charge): $75
Helsinki (includes Passenger Fee, International and Security Charge): $72
London (includes UK Air Passenger Duty and Passenger Service Charge): $115 (Business Class tickets may add additional fees)
Oslo (includes Passenger Service Charge): $74
Paris (includes Aviation Civile Tax, French Airport Tax and Passenger Service Charge International): $100
Reykjavik (includes Airport Service Charge): $90
Stockholm (includes Passenger Service and Security Charge): $80
Taxes and official charges on international airline tickets are imposed by the US government, and that of the destination. The tax amount is not a percentage of the fare amount, and therefore does not change according to the base fare. More fees may be added for travel involving multiple stopovers.