Airline Tickets Explained, what are the elements of cost on my Airfare

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There are several avenues to get an airline ticket today. You can go online to the airlines website or a third-party travel site. You can call a travel agency or a tour operator. Or you could go into an airline ticket office. Irrespective of how or where you purchase your ticket there are several variables that determine the amount that you pay.
Most agencies and some airlines charge a service fee for ticket purchase. These fees vary and are independent of the price of the actual ticket. Apart from these fees the actual cost of an airline ticket comprise of three main components.
1.       Government taxes, fees and charges
2.       The Carrier's base fare,
3.       Carrier imposed service fees which are optional

Government Taxes, Fees and Charges (TFC)