The airport receives more worldwide passenger traffic - more than 31 million people in 2016 - than any other US airport.
The water main was the latest bad news for the airport, which has scrambled to fully function since the "bomb cyclone" storm blasted much of the East Coast on Thursday.
As of Sunday night, more than 500 flights had been cancelled or delayed, according to flight tracking website FlightAware. The storm struck as many travelers were making their way home from end-of-year holidays and 2018 business travel was getting going. "Please allow extra time and contact your airline".
The official Twitter account for the Port Authority of NY and New Jersey tweeted news of the break, which also led to a shutdown of global arrivals into Terminal 4. The ongoing complications drew social media outrage and even fisticuffs amid tangled flight schedules. The Federal Aviation Administration on Saturday suspended arrivals of some flights. Other flights were diverted.
"My son and others had to pay for a taxi back to the hotel where they were told that if they wished, they could have a refund for their flight and could try to get on another flight".
QUEENS -JFK is nearly back to normal - and that means long lines, delayed flights and thousands of frustrated passengers. The immediate future wasn't much brighter - the forecast for Monday afternoon and evening called for more snow and ice.
So what complicated the cleanup from a one-day storm?
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Cotton said the Port Authority would investigate why the pipe broke and "hold all responsible parties accountable".
For airlines, the advantage of this arrangement is they have dedicated gates and facilities for their operations. One plane even clipped another outside a terminal amid the hard conditions early Saturday. For one, gates are often allotted to scheduled flights. He said the pipe that burst was an internal fixture, but apparently had not been weather-proofed. Passengers were evacuated from the terminal after a portion of it flooded, and while it reopened later that day, operations were snarled again. However, the airport is still issuing regular alerts saying: "There may be delays at JFK". A succession of flights had been cancelled and thousands of passengers stranded before the incident, adding to a tense situation in a terminal that had already seen scuffles and hours-long waits at baggage claim to retrieve belongings.
Officials are urging travelers to check their airline for their flight's status before coming to the airport. Many complained about a lack of communication from airlines about whether flights would take off as the storm left some flights without crews, which have strict limits to their working hours to ensure adequate rest.
Worldwide flights are coming into JFK Airport's Terminal 4 after they were shut down earlier Sunday due to a water pipe break that has delayed flights all day. It also serves at Delta's worldwide hub.
"The airlines don't help themselves when they are not providing accurate information and customers are spending a lot of their own money [to get to the airport]", said Henry Harteveldt, a travel consultant and founder of Atmosphere Research Group.
"There are 300 passengers there and I should say they're becoming restless", he said.