Frontier Airlines will start service to 12 new destinations from Philadelphia International Airport (PHL) in May, including Chicago, Detroit and Indianapolis.
Wildfires in Canada have slowed or paused air traffic in portions of the U.S. northeast, as smoke drifts south in quantities large enough to impact visibility.
The airlines have vowed to ‘vigorously rebut’ claims their partnership is a 'de facto merger,' saying their Northeast alliance boosts competition by offering new routes and increased service.