Hurricane Florence is on a path for the United States as a Category 4 storm, and it's expected to hit the east coast on Thursday night.

One million people are evacuating the Carolinas as the hurricane nears, and airlines across the country are issuing travel waivers and alerts. Below are the latest.

Allegiant Air

Dates: Sept. 12-16

Cities: Asheville, NC (AVL), Charleston, SC (CHS), Concord, NC (USA), Greensboro, NC (GSO), Greenville, SC (GSP), Myrtle Beach, SC (MYR), Norfolk, VA (ORF), Richmond, VA (RIC), Roanoke, VA (ROA), Savannah, GA (SAV)

Passengers with reservations to/from any of the cities will be able to request a one-time change to their plans without a charge. Customers must call Allegiant Customer Care at 702-505-8888 at any time 24 hours per day, seven days a week. Itineraries must be changed within 14 days from this weather advisory

Alaska Airlines

Dates: Sept. 10-16

Cities: Charleston (CHS) and Raleigh-Durham (RDU)

We will waive the change fees and the difference in the price of the ticket if the new travel is booked to or from the affected cities in the same cabin and travel is completed during the new travel dates listed above. Additional taxes may apply. If you choose not to travel at all, you may cancel your trip and request a refund.

New travel dates: Sept. 10 - Oct. 1

American Airlines

Dates: Sept. 10-16

Cities: Asheville, North Carolina (AVL), Augusta, Georgia (AGS), Charleston, South Carolina (CHS), Charlotte, North Carolina (CLT), Charlottesville, Virginia (CHO), Columbia, South Carolina (CAE), Fayetteville, North Carolina (FAY), Florence, South Carolina (FLO). Greensboro / High Point, North Carolina (GSO), Greenville / Spartanburg, South Carolina (GSP), Greenville, North Carolina (PGV), Hampton / Newport News, Virginia (PHF), Hilton Head, South Carolina (HHH). Jacksonville, North Carolina (OAJ), Lynchburg, Virginia (LYH), Myrtle Beach, South Carolina (MYR), New Bern, North Carolina (EWN), Norfolk, Virginia (ORF), Raleigh / Durham, North Carolina (RDU), Richmond, Virginia (RIC), Roanoke, Virginia (ROA), Savannah, Georgia (SAV), Wilmington, North Carolina (ILM)

Change fee will be waived if you can travel by Sept. 10-19 and change your origin and destination to another city affected by this alert

Delta Airlines

Dates: Sept. 13-16

Cities to/from: Charleston, SC (CHS), Fayetteville, NC (FAY), Greensboro, NC (GSO), Jacksonville, NC (OAJ), Myrtle Beach, SC (MYR), New Bern, NC (EWN), Norfolk, VA (ORF), Newport News, VA (PHF), Raleigh-Durham, NC (RDU), Richmond, VA (RIC), Savannah, GA (SAV), Wilmington, NC (ILM)

Rebooked travel must begin no later than Sept. 20, 2018, but when rescheduled travel occurs beyond Sept. 20, 2018, the change fee will be waived

Frontier Airlines

Dates: Sept. 10-16

Cities: Charleston, SC (CHS), Charlotte, NC (CLT), Greenville-Spartanburg, SC (GSP), Myrtle Beach, SC (MYR), Norfolk, VA (ORF), Raleigh-Durham, NC (RDU), Savannah, GA (SAV)

Customers who are ticketed to travel between Monday, September 10, 2018 and Sunday, September 16, 2018, who purchased tickets on or before Monday, September 10, 2018, may make one itinerary change – rules/restrictions regarding standard change fees, advance purchase, day or time applications, blackouts, and minimum or maximum stay

requirements will be waived. Travel must be completed no later than Monday, October 1, 2018.

jetBlue

Dates: Sept. 13 - 15

Cities to/from: Charleston, SC (CHS), Charlotte, NC (CLT), Raleigh/Durham NC (RDU), Richmond, VA (RIC), Savannah, GA (SAV)

Customers can rebook flights for travel through Sept. 20 with change/cancel fees waived and fare differences waived.

Southwest Airlines

Dates: Sept. 10 - 17

Cities to/from: Baltimore/Washington (BWI), Charleston, SC (CHS), Charlotte, NC (CLT), Greenville-Spartanburg, NC (GSP), Norfolk/Virginia Beach, VA (ORF), Raleigh-Durham, NC (RDU), Richmond, VA (RIC), Washington Dulles International (IAD), Washington DC Reagan National (DCA)

Customers may rebook within 14 days of their original day of travel without paying an additional charge

Spirit Airlines

Dates: Sept. 12-16

Cities To/From/Through: Asheville, NC (AVL), Greensboro, NC (GSO), Myrtle Beach, SC (MYR), Richmond, VA (RIC)

Modification charge/fair difference waived through Sept. 20. After the date the modification charge is waived but fare difference may apply

United Airlines