I've been tracking NYC-MLI for a few summer weekends, and NW has been steadily increasing there, too (an issue exacerbated by TZ's pull-out from MLI--thank goodness FL is still in there to hold things down). Yet NW is still the cheapest on LGA-MLI at $268, and third cheapest on EWR-MLI at $319 (FL comes in at $252 and DL at $308). UA and AA are over $330 from both LGA and EWR.

I'd like to see some of those $200 fares I was seeing last summer, since I've got to get a lot of folks into MLI in July for a family event. With oil continually going up, it doesn't look likely.