What is TransWest? Is this a typo, or something real? In a message dated 8/7/2004 11:36:11 AM Central Daylight Time, psa188@xxxxxxxx writes: But SFO is making improvements, McCarron emphasized. Increased traffic of airlines such as ATA, Frontier and TransWest, has nearly doubled the airport's percentage of discount flyer traffic in the past year alone. Last month's announcement of the startup low-cost airline Virgin USA making its home in San Francisco will increase that figure even more. SFO has a goal of 20 percent discount flights.