The upcoming nor'easter sounds yet more ominous: Airlines are once again canceling flights in the Northeast in anticipation of the coastal storm, just a week after canceling more than 23,000 flights in the same area because of superstorm Sandy. United Airlines is canceling around 500 flights out of Newark, JFK, and LaGuardia airports between noon tomorrow and noon Thursday, the AP reports. Other airlines are evaluating which flights to ground. (More nor'easter stories.)