DL is all RJ, and after we go to Express NW will be the only one left with Mainline flights using DC-9''s. From what I know they only have one a day to DTW. As for US adding anything back, who knows. As I am sure you know there were 5 flights to PIT, 2 to CLT and 1 to MCO in the past....most did very well....where have all those passengers gone????