Trump was being briefed by the head of the Federal Emergency Management Agency in the Oval Office on Tuesday.
The airlines affected by the waivers vary from city to city, but most are now in the path of Florence as meteorologists are tracking the category 4 storm. Power and water outages could last for weeks.
The governors of North and SC and Virginia declared states of emergency far ahead of the approaching storm.
On its current track Florence is expected to slam the Carolinas and Virginia the hardest - and all three states have issued emergency declarations to speed preparations.
Trump announced the action Tuesday. Any Category 3, 4 or 5 hurricane is classified as a major hurricane. The action frees up federal funds and resources.
In Jacksonville, North Carolina, about 20 miles inland, some residents picked up hurricane supplies during their normal weekend shopping, The Daily News reported.
Florence is expected to be an extremely risky major hurricane through Thursday night.
Skerrit said he was urging all citizens "to take these warnings seriously".
Concerns about the monster storm extended even into Virginia. Rescuers will not be able to reach you during the storm.
Oosterwyk was gathering tax documents and other important papers from her store on Monday, and said she planned to drive 150 miles (240 km) inland to ride out the storm in the town of Cary. "Don't bet your life on riding out a monster".
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Meanwhile, roughly one million people have been ordered to evacuate from South Carolina's entire coastline. But getting out of harm's way could prove hard. People rushed to get emergency kits ready, map out escape routes, fill sandbags and secure their homes.
Meanwhile, two other storms were also spinning in the Atlantic.
"The building we're going to board some windows up".
As of 5 p.m. ET Monday, the center of Florence was located about 1,170 miles from Cape Fear, North Carolina, and was moving to the west-northwest at 13 mph.
Not only has the storm exploded in intensity, but its zone of hurricane-force winds approximately doubled in size Monday. The flooding might be similar to what the Carolinas experienced during Hurricane Matthew in 2016.
On Parris Island, South Carolina, recruits were ordered evacuated from the Marine Corps' biggest training installation on the East Coast.
Florence interrupted her stay on North Carolina's Outer Banks.
"The water could overtake some of these barrier islands and keep on going. Eighty-five degrees", Matheson said, pausing a moment. With sustained winds as high as 130 miles per hour!
"I'll see by Wednesday how that goes - we got over 48 hours before that happens", Cesal said.
In the six decades since, many thousands of people have moved to the coast.