TWO HUNDRED YEARS ago the cost was seven years to a lifetime of servitude for average people making a one-way crossing of the Atlantic. While now it can be funded by a few days of waiting tables, airfare is still the single greatest expense for most budget travelers. When booking through an agent, always specify you want the "lowest possible fare," as there may be specials which do not fall under "economy" or "APEX." Moreover, not every agent--even with the budget specialists listed below--will be equally competent or motivated to find the cheapest ticket. They may not know about a great deal the next cubicle has been selling all week, or the commission may not merit bothering much. Likewise, buying a ticket on the Internet is not the same as getting the cheapest price. As with any travel agent, you may be offered the lowest price, an average price, or a test price. You still have to make comparisons and move boldly when a deal presents itself. A good strategy is to book the best-value, fully-refundable fare early, then continue looking for something better to pop up. You may find an cheap flight from Chicago to Houston on the main leg, but a high one on the connect. Try reversing the search, or book one leg at a time. Allow at least three hours between flights for international departures/changeovers. Often the best deals are offered directly by airline websites. In some cases you sign-up with the airline and they notify you via email of hugely-restricted but incredibly cheap specials a few days before the flight. These include American, United, Continental, Northwest, Southwest (the U.S. low-fare and efficiency leader), U.S. Airways, TWA, Delta, Alaska, Canadian, Carnival, and Cathay Pacific (which periodically auctions--with minimum bid--several hundred seats on New York and Los Angeles to Hong Kong runs.)

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