In many secondary airports, the contract lounges also serve the premium guests of international airlines and I found the service to be good to great! (dreamtravelonpoints.com)
Even in metropolitan areas there are many relatively uncongested secondary airports used primarily for general aviation — e.g., 24 in the Dallas - Fort Worth area, 17 around Chicago, 16 ringing New York City. (si.com)
Norwegian is also steadily expanding its transatlantic routes through many secondary airports located throughout the East Coast of the US this summer, such as PVD (Providence, Rhode Island) and SWF (New York). (uponarriving.com)