STEWART AIRPORT – Norwegian Air will close its cabin crew and pilot bases at New York Stewart International Airport later this year, a cost-saving move that will not affect current flight schedules.The closings, and an identical action at T. F. Green Airport in Providence, R.I., follows a steady reduction in flights at both airports that welcomed Norwegian as their first international carrier only 18 months ago.At Stewart, where the low-cost carrier has almost single- [...]