By supplying terminals in smaller cities like New Haven, Connecticut, which were overlooked by nationwide companies, Velo Airlines and Breeze Airways have found success and loyal clients. One cool Thursday evening this month, the smaller airport in New Haven, Conn., was buzzing. A range of trucks stretched from the switch, down the main road and into a community. A fresh, second-floor table at the airport was crowded as people on the floor below walked through a doorway into one of three waiting aircraft. Five years ago, Tweed-New Haven Airport would have been much louder. Up then, it hosted about a half-dozen regular flights, mostly little American Airlines jaunts to and from Philadelphia. This month, about 30 planes a moment were connecting the aircraft to more than two dozen places. The revival of this aircraft, which is close to Long Island Sound, is a result of long-standing industry changes that gave rise to the possibility for two start-up airlines, Breeze Airways and Avelo Airlines, to travel from airports that the nation’s biggest airlines have largely neglected. The next generation of business framework and evolution is what we’re definitely seeing, according to John Powerful, a company professor at the College of William & Mary with a focus on the airline industry. Aviation is harsh. Competition is fierce, the barriers to entry are large and success is unstable. After years of merger, four big flights control two-thirds of private air travel. The majority of their flights land or depart in big airports, which has increased the efficiency and overall profit of their operations. But over time, the major airlines trimmed company at smaller flights. ImagesAvelo has reported revenue for a number of years. Christopher Capozziello, a payment to The New York Times Please make Browser available in your browser’s options. Thank you for your patience while we verify exposure. If you are in Audience mode please leave and log into your Times accounts, or listen for all of The Times. Thank you for your patience while we verify entry. Now a customer? Register in. Want all of The Times? Subscribe.