Even BTV has 2-3x daily to ORD with 737's from December to May! I wouldn't even mind regional jets to DTW / ORD but 1-2x daily just doesn't cut it for good connecting options.May 22nd - October 25th to Denver is all we've got for now. And you are correct, westbound off season options are Delta to DTW and United to ORD on regional jets. It's criminal!