United is now in the process of deciding if it will honor the fares purchased.
The airlines offered another 10percentt discount for fares purchased through their Web sites.
United Airlines took out ads yesterday reminding business travelers that its 25percentto50percentcent off sales on fares purchased 10 or 21 days in advance continue through the end of September.
Monthly, semimonthly, and even daily passes are sold on many systems, which keeps fare purchase off the vehicle and makes the process of checking for prepayment fast.
Stations outside the center are unmanned since the 1995, with ticket machines for fare purchase; some stations feature kiosks.
Also in the dataset are detailed information on the non-food expenditure, which includes expenditure on education, healthcare, housing (house rent, cost of maintaining the house and the furniture), clothing (clothes, shoes), utilities, house appliance, transportation (transport fares, petrol purchased, maintenance of cars, bicycles), and communication.
Among current Air France promotions are a half-price fare for a companion with a full-fare purchase, based on availability, and a one-way fare of $4,254, about 18percentt less than the usual $5,202, available with a purchase at least four days before departure.
Last March, Southwest made an even more fundamental change in its loyalty program, moving from a system that awarded participants credits for flights, regardless of distance flown or fare paid, to one that gives participants points based on the types of fares they purchase.
Just remember that the fare must be purchased before midnight the day before travel.
Chris Nardella, a spokeswoman for United, said one possible explanation is that if customers click on the e-fares link on Saturday, Sunday or Monday, they would encounter that message because the special fares must be purchased by Friday for a Saturday departure.
