Hurricane Dorian has made landfall on the coast of Florida.
The storm passed through the Bahamas over the weekend, leaving widespread damage.
Delta has extended its travel waiver for the Bahamas through September 21 due to airport infrastructure damage caused by the hurricane. A waiver remains in effect for Florida through September 6, and Georgia and North and South Carolina through September 7. Orlando International Airport has suspended flights until September 5.
The airline has also capped fares, waived baggage and pet-in-cabin fees and restricted unaccompanied minor travel to and from cities in the potential path of the storm.
American Airlines said it had cancelled 180 flights on September 4 and 40 on September 5. Its operations at Fort Lauderdale have resumed and Orlando International Airport resumed operations on the evening of September 4.
Miami International Airport has confirmed that it is open, however it advises passengers to follow up with their airline about whether their flights are cancelled.
Walt Disney World in Florida has resumed operations, with all parks open except for Blizzard Beach Water Park.
The storm is expected to hit North and South Carolina later in the week. Evacuations affecting two million people in the south-eastern US began on the morning of September 2.