Pleasure travelers can expect to pay more for a plane ticket this summer. Continental raised its fares by 4 percent over memorial day weekend. Every major airline, including Twin Cities based Northwest, has followed suit. This is the third time U-S airlines have raised prices this year. Terry Trippler is an airline expert who runs the website onetravel-dot-com. He says that given the current market for airtravel, this latest fare increase is not surprising.