JetBlue has cancelled 882 flights so far, from Saturday through Monday, most of them at JFK Airport. The airline is waiving some change fees for cancelled flights—check their official site for more details.
The Port Authority has said they will be ready with “hundreds of cases of bottled water, diapers, cots, blankets and pillows” for any passengers that get stranded due to heavily delayed or canceled flights, and they have arranged to have at least one food vendor open day and night at JFK and LaGuardia.
As Crains warns, more cancellations will follow as Irene gets closer and airlines can "pinpoint airports at the most risk." As one airline executive puts it, “They'll be doing a lot of scattering and scrambling."