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Three US Aviation companies (United Airlines, American Airlines and Delta Air Lines) have increased their fares by $6 per round trips on flights to some cities. Lower-cost carriers also serve it. United, a unit of UAL Corp. said that the new plan will come into force on Thursday and will be applied to most routes. However, Southwest Airlines Co. didn’t support the move. Globally increasing rates of crude oil force companies to increase their fares and from the last two years prices have risen many times.

Via: msnbc