Here is a "revenue" ticket fare bought recently for a European destination.
Look at the fuel surcharge

Fare Summary
Passenger Type Adult
Departing Flight - Business Class (lowest)
845.74
Returning Flight - Business Class (lowest)
816.34
Surcharges
30.00
Sub Total 1692.08

Taxes, Fees and Charges
Canada Airport Improvement Fee
25.00
Air Travellers Security Charge (ATSC)
25.91
Fuel Surcharge
856.00
Canada Harmonized Sales Tax (GST/HST #10009-2287 RT0001) 3.25
Airport Security Charge 9.04
Passenger Service Charge 49.70
JD Tax 21.67
OG Tax 0.83
Security Tax 5.35
Total airfare and taxes (per passenger) 2688.83