Passenger growth hasn’t met initial projections, but T.F. Green Airport supporters insist a $250M upgrade will pay off

Fifteen years ago, when the planning process for extending the ­primary runway at Warwick’s T.F. Green Airport had already started, projections of airport use showed nothing but growth, with the expectation of 11 million passengers by 2020. As it turned out, those predictions were more hopeful than accurate. Airport passenger traffic topped out in 2005…