I don't care how slick Fort Wayne International Airport's marketing campaign is. If it's a whole lot cheaper to fly out of Indianapolis, more people are going to fly out of Indianapolis. If there only a $40 or $50 difference, sure, some people might be convinced by billboards saying "Sleepless? FWA to Seattle -- 10 times a day" or even "Bonjour Times Four -- FWA to Pairs -- 4 times a day" (although that last one is doubtful). But when it's routinely more than $100 more expensive to fly out of FWA, and sometimes even $600, no way.
