How about your flights in?
EAU went from arrivals at noon, 4:30ish, 8 PM and 11 PM to just the first three. On top of that, they started enforcing a maximum connection time in MSP of 4 hours. Now virtually impossible to get in from the west coast - most day flights miss the last flight of the day with no 11 PM arrival, and can't take the redeyes because they get in too early to make the 4-hour connection window for the noon flight.
So now all my west coast travel has me driving/shuttling to MSP; at which point, why not just take the cheapest airline from all the options available?
On the upside, all our service is 340's, so can't go any further down than the bottom! (not that it matters for a 27 minute flight)