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Airlines use sophisticated algorithms to calculate demand for their seats. These so-called yield management systems mean that the price youre being quoted for a flight may not be the lowest one. Its based on demand for that flight based on historical averages. Whats more, if you dont push the buy button now, the fare may be gone in a few minutes. A

You may think you need a credit card to purchase an airline ticket. But a debit or prepaid card will work just as well. And your options may even expand to cash and checks if you book your flight through a travel agent or if you purchase your ticket at an airport ticket counter.

Buying airline tickets, however, does not have to be a difficult task because major airlines offer electronic ticket purchase online. Anyone can buy a ticket online, even for someone else, by entering the information of the potential flier as it appears on her government-issued photo ID card.

We've all experienced the tiresome, repeated searching when trying to book the cheapest possible flights to any given destination. With endless search engines and continually fluctuating prices, the approach to frugal flight booking is overwhelming. Keep your searches top secret. Use the best flight search engines. Identify the cheapest day to fly

Some airlines may request you to enter your passport number when booking an international trip, but this information is not required at the time of booking. However, you must present your passport at the airport to TSA employees before you will be allowed to board an international flight.