As the number of low-cost carriers has grown, these airlines have begun to compete with one another in addition to the traditional carriers. In the US, airlines have responded by introducing variations to the model. JetBlue Airways advertises satellite television. Advertiser-supported Skybus Airlines launched from Columbus in 2007, but ceased operations in April 2008. In Europe, the emphasis has remained on reducing costs and no-frills service. In 2004, Ryanair announced proposals to eliminate reclining seats, window blinds, seat headrest covers, and seat pockets from its aircraft.