Likely mostly the season, and taking some time for our name to get out there. When Spirit started its first big Vegas build up in 2011, it was around the same time of year (late AUG- early SEPT). The loads were abysmal, 20-30 pax per flight for several months(though Fri's into LAS and Sun's out of LAS were always pretty full). Now it's rare to find a flight that has more than a few open seats midweek, middle of the off season, Between LAS and any city. I'm sure they'll adjust some frequencies and possibly make some routes seasonal if need be. And if it MCI and/or CLE doesn't pan out, they'll put the planes where they do make money, it's the Spirit way and it's been working.