I know it's not what you are asking, but as a fellow HVN area flyer, wouldn't it be worth a 45 minute drive to BDL to get a DFW nonstop? HVN-PHL is a tiny turboprop, then you have to grab a shuttle in PHL. Tweed-New Haven is a great no-hassle airport but for a DFW flight driving to BDL is much quicker than connecting in PHL.