Frontier Airlines is adding two low-fare routes from T.F. Green Airport starting in April.  One is to Atlanta and the other is to Austin, Texas. Governor Gina Raimondo says it's the latest example of why T.F. Green is one of the best airport's in America.  Frontier already offers service from Warwick to Orlando and Tampa, as well as seasonal flights to Charlotte, Denver, Fort Meyers, Miami, Raleigh-Durham and New Orleans.