Royal Caribbean International, Disney Cruise Line, and Norwegian Cruise Line have extended the itineraries for some cruises that began in Florida as Hurricane Dorian nears the state.

Six Royal Caribbean ships that boarded in Orlando, Miami, or Fort Lauderdale will return later than expected, the company said on its website. The Harmony of the Seas faces the longest delay, as it is scheduled to return to Orlando on Thursday, four days later than planned.

"Please know, our guests and crew safety is our top priority and being onboard a ship is one of the safest places to be during a storm," the company said.

One of the ship's passengers told the CBS affiliate WTVR on Tuesday that the storm had delayed her kids' return to school and her return to work.

"My kids are going to miss the first week of school, my dogs are in a kennel so I'm anxious to get back to them, and we also have two businesses," she told the station.

Read more: Hurricane Dorian is slowly inching from the Bahamas to the US, leaving devastation in its wake

Disney Cruise Line said its Disney Dream cruise would return to Orlando on Thursday, one day later than expected.

"The safety of our guests and crew is always our foremost concern," the company said on its website.

Norwegian Cruise Line said it was extending its August 25 Norwegian Breakaway cruise by two days and changing its final destination from Miami on September 1 to New Orleans on September 3.

"While it is our every intention to maintain the original itinerary as much as possible, the security of everyone on board always takes precedence," Norwegian said on its website.

While Carnival Cruise Line has not extended any cruises, it said on its website that the Carnival Ecstasy might not return to Jacksonville on Thursday as planned.

In addition to extending some cruises, the cruise lines have canceled or changed the itineraries for several others.

Dorian has killed at least five people in the Bahamas. Effects of the Category 3 storm could be felt in Florida as soon as Tuesday evening, forecasters have said.

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