The carrier’s chief executive said it “took a big drop in bookings for a few weeks” as Newark suffered several radar outages.

After several weeks or rumours that a new airline partnership was gathering momentum, US carriers United Airlines and JetBlue Airways have revealed plans for a "unique consumer collaboration" that will start this fall.

United Airlines faces ongoing operational challenges at Newark Liberty International Airport, a key hub for the carrier. Despite flight reductions intended to ease congestion, the airline continues to explore strategic alternatives to maintain revenue and enhance the passenger experience.

United Airlines’ second-quarter profit will fall well below its original outlook because flight disruptions and air traffic control outages at its Newark hub have driven away passengers and forced the carrier to cut ticket prices for the summer.

JetBlue and United Airlines have introduced Blue Sky, a joint loyalty program that gives travelers twice as many opportunities to earn rewards and miles.

Scott Kirby said recent problems at Newark hurt its bottom line, at WSJ’s Future of Everything event.

Newark Liberty International Airport is one of the largest hubs of United Airlines , and the congested airport is also the Chicago-based carrier's biggest operational challenge.