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Hurricane Irma will affect flights out of Charleston International Airport to south Florida over the weekend. File/Leroy Burnell/Staff

Flights to south Florida from Charleston remained on schedule Thursday but will be affected late Friday as Hurricane Irma approaches the U.S. over the weekend.

American Airlines and JetBlue Airways offer daily service from Charleston to Miami and Fort Lauderdale, respectively.

Fort Lauderdale-Hollywood Airport will suspend operations late Friday with the last flight leaving at 7:45 p.m., according to its website. The airport will remain closed Saturday and Sunday.

In Miami, the Federal Aviation Administration does not close the control tower until sustained winds reach 55 mph, when planes cannot take off or land, according to Miami International's website.

Depending on the storm's path and severity, it could affect operations at Charleston International. Passengers are urged to check with their airline for the latest updates.

"We anticipate that worsening weather conditions will affect airport operations," airport officials said in a statement.

Charleston Air Force Base owns the runways at Charleston International and will determine if and when flights could be curtailed locally, according to airport CEO Paul Campbell.

Charleston International will cease to operate when sustained cross winds reach 40 mph, according to terminal officials.

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JetBlue's website says it will waive fees and increases in fares for customers at Charleston International and Savannah/Hilton Head International airports on Sunday and Monday. Travelers can ask for a refund on canceled flights or rebook them.

American Airlines' website says operations at Miami and other Florida airports likely to be in the storm's path will be shut down over the weekend as conditions warrant.

The latest forecast on Thursday calls for powerful Irma to remain a major hurricane as it approaches south Florida early Sunday.

Reach Warren L. Wise at 843-937-5524. Follow him on Twitter @warrenlancewise.