Passengers are seeing hundreds of flight delays and cancellations as a winter storm blasts across the central and eastern United States, while Boeing 737 MAX 9 planes have been grounded. 

Following hours of snowfall and rain overnight, a second wave is expected to hit Chicago on Tuesday, the National Weather Service said. As most of the city is under a winter weather advisory or a winter storm warning, more than 100 flights have been canceled at O’Hare and Midway International airports, according to a site run by the Chicago Department of Aviation. 

A winter storm left heavy snowfall in New York’s Hudson Valley this weekend, ranging from 5 inches to up to 18 inches as of Sunday. Rolling into this week, blizzard warnings were issued across the Great Plains, including a rare blast in western Washington. 

Snowstorms caused travel disruptions in Boston and New England while crews worked to clean up the runways. Manchester-Boston Regional Airport Director of Aviation Ted Kitchens warned on Sunday there can be no more than a quarter inch of snow on the runways, according to WMUR 9. 

The Federal Aviation Administration on Saturday announced it would ground some Boeing 737 MAX 9 planes for safety inspections after an Alaska Airlines plane made an emergency landing in Oregon last week when a panel blew off shortly after takeoff from Portland International Airport. 

As of Monday, the National Transportation Safety Board said it was investigating whether the detached panel from Alaska Airlines Flight 1282 was properly attached. 

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“We have not yet recovered the four bolts that restrain it from its vertical movement,” NTSB engineer Clint Crookshanks said at a press conference Monday evening. “We have not yet determined if they existed there. That will be determined when we take the plug to our lab in Washington, D.C.”

Alaska Airlines and United Airlines said technicians found loose bolts during inspections of its 737 MAX 9 fleet following the FAA’s order.