If you thought U.S. airlines had milked the ancillary revenue cow to the maximum, think again. Airline chiefs believe there’s a lot more where that came from. “We think there’s still some nice upside” to ancillaries, said David Barger, chief executive officer of JetBlue Airways. “We’re looking at a 10% to 15% increase in ancillary revenues on a year-over-year basis.” United Airlines, which got an early start on inflight extras with its Economy Plus product, has set a goal of increasing ancillary revenues by 9% this year, according to chief executive officer Jeff Smisek. Southwest Airlines has avoided some of the controversy over ancillary fees by not charging for checked bags. Now Southwest plans to “start moving to tighten some of the restrictions on our lowest-price fares, sometime in 2013,” said Tammy Romo, chief financial officer and senior vice president of finance. The executives made their comments at the J.P. Morgan Aviation, Transportation & Defense Conference in New York last week, addressing an audience of institutional and credit investors who look kindly on airlines’ efforts to boost revenues. Get the full story at Travel Market Report Read also "Airlines’ new pricing plan could take frequent fliers for a ride"