I haven't flown them, but I've spoken to the folks at BIL, and they've told me that the loads on BIL-DEN have been TERRIBLE lately. But, I know they were excellent (upwards of 90%) during december. Hopefully it's just a seasonal slump.
Its probably seasonal. Everything has bad loads in early January. I'd expect some adjustments to the schedules and possibly some reduction in service if it continues into the summer. I just don't think some of these cities can support three flights a day on a 74 seat aircraft.
"A pilot's plane she is. She will love you if you deserve it, and try to kill you if you don't...She is the Mighty Q400"