Being almost exclusively based of out DCA I fly Delta. I am a soon to be PM. While, I am not thrilled about the Skymiles program I can live with it. Miles are easy to come by, so that negates the inflation a bit. Also I receive great customer service both on the ground and in the air. I would like to try other airlines, mainly AA, but the only one that offers anything near Delta's frequency to where I need to go is US and I try to avoid them at all costs.