Travelers heading home from extended Labor Day getaways or heading out on business trips faced another day of heavy flight cancellations Tuesday.

Airlines have canceled more than 1,800 Tuesday flights to, within and from the United States as of 10:15 p.m. EDT, according to flight tracking service FlightAware. That is on top of nearly 1,500 on Labor Day.

Florida airports remain the hardest hit due to Hurricane Dorian. Forty percent of the cancellations, or 734 flights, were flights to and from Orlando International Airport. The central Florida airport, a magnet for vacationers, ceased commercial operations at 2 a.m. Tuesday. The airport had earlier rescinded plans to close on Labor Day, though flight cancellations were still heavy. The airport has not said when it plans to reopen, but the FAA website shows it is expected to reopen at 5 p.m. Wednesday.

Labor Day flight cancellations: 1,400 and counting as Hurricane Dorian approaches East Coast

Other Florida airports with heavy inbound and outbound flight cancellations Tuesday, according to FlightAware:

Fort Lauderdale International: 297. The airport closed Monday at noon and reopened Tuesday afternoon.

Miami International: 136. The South Florida airport said it is no longer in the cone of concern for the hurricane but warned passengers about residual flight cancellations.

Palm Beach International: 100. The airport in West Palm Beach ceased flights Monday. It initially planned to reopen Tuesday afternoon but has delayed its reopening until Wednesday morning at 8 a.m., according to the FAA website.

Travelers don't have to be headed to or from Florida to be affected by the travel mess.

Cancellations are starting to grow, though they are still relatively insignificant, in two major airline connecting hubs in the region, Atlanta and Charlotte, North Carolina. Atlanta is a hub for Delta Air Lines, and Charlotte for American Airlines.

Another trouble spot Tuesday morning: Chicago. Storms have canceled 427 flights at Chicago O'Hare International Airport and 42 at Chicago Midway International Airport.

Passengers are advised to check with their airlines for flight status and any rebooking help, though some airlines are warning their phone lines and other support channels are overwhelmed.

United on Monday advised passengers not to go to the airport for rebooking but to use the airline's website or customer service center.

Those with upcoming travel plans in the region are eligible to change their flights without the usual penalties under airline travel waivers in place since last week. Airlines have added new cities to their waivers as Dorian's path has shifted and have expanded the travel dates.

For the latest airline waivers for Hurricane Dorian

American Airlines

United Airlines

Delta Air Lines

Southwest Airlines

JetBlue Airways

Spirit Airlines

Allegiant Air