In an announcement that I’m sure US Airways was dreading, Southwest said that they will begin service to Pittsburgh in May. US Airways has about 2/3 of the Pittsburgh market right now, though that number is considerably smaller than the amount it used to control. Southwest’s move is miserable for US Airways for 2 reasons. First is the obvious reason that it will have to compete. More awful is that potential financial saviors know that it will be a costly and brutal fight in Pittsburgh. This is not good news for US Airways…duh.