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In many City Pairs flights, there are two contract fares, also known as Dual Fares: a highly discounted unrestricted fare (YCA), and a capacity controlled fare (_CA) with an even deeper discount.
_CA fares have a limited number of seats, but no other restrictions. _CA seat availability on a particular flight varies carrier-by-carrier and market-by-market.
The _CA airfares allow an agency to save the most money possible, while still enjoying the same top quality service available with YCA fares. Use of the _CA fares is encouraged by the Federal Travel Regulation (Note 3 to 301-10.107).
To maximize possible savings, book early and consider the following:
The earlier the reservation is made, the greater the chances that an agency will receive additional savings. To find fares, use the City Pair Program search tool.