More than 1,000 flights were canceled and more than 5,800 flights were delayed on Tuesday, according to data from FlightAware.
Some of the flight cancellations are due to the grounding of the Boeing 737 Max 9.
United Airlines told CNN it canceled 170 flights on Tuesday because of the Max grounding.
Alaska Airlines has not said how many Tuesday cancellations are due to the Max but, said the airline has canceled between 140 and 170 flights daily since the Federal Aviation Administration-mandated grounding, pending inspections of the planes.
Orlando International Airport and Tampa International now have FAA ground stops for arriving flights due to thunderstorms. Flights arriving at LaGuardia Airport in New York are delayed more than an hour due to wind.
Citing thunderstorms, the FAA ordered a broad hold on Charlotte-bound departures that applies to airports from Texas to Indiana and Miami to Washington, D.C.
Earlier in the day, the FAA also held flights bound for Atlanta – the world’s busiest airport – and Dallas Fort Worth. The FAA also warns of Tuesday afternoon and evening disruptions along the East Coast, from Florida to New York. It has closed some flight routes due to thunderstorms, causing it to hold some Florida-bound flights.
On the nation’s rails, Amtrak has canceled multiple East Coast trains for Tuesday and Wednesday. The agency has either canceled or shortened the routes for more than 17 Acela, Northeast Regional and Keystone (Pennsylvania) trains on Tuesday and Wednesday.