In addition to this, Key Lime Air has recently begun serving the airport with daily scheduled services on the Swearingen Metroliner to Walker Field in Grand Junction, operating as Denver Air Connection. They do have a 3 million dollar maintenance facility at APA and APA is the preferred airport, however as per those NIMBY rules again, APA's limit to scheduled service is aircraft with 9 or fewer passengers (and nobody wants to ride 3 hours on a Piper Navajo when they can ride for 45 minutes on a CRJ). Also, in February 2005, BJC hosted an Air Canada Jetz A320 that had been chartered by U2 for the Vertigo tour.