Flights were resuming at some hard-hit airports in the Carolinas, but normal operations remained days away for others as the remnants of Hurricane Florence continued to spin over the region on Sunday morning.

At Charleston International Airport, the busiest along the coast of the Carolinas, Delta Air Lines resumed some flights on Saturday. Other airlines -- including United, Southwest and JetBlue -- had also restarted Charleston operations Sunday, and it appeared possible that a full schedules was possible by Monday afternoon. With the reopening, however, the airport warned travelers to arrive early, saying: "We expect there will be lines as our airlines resume normal operations."

Flights also resumed Sunday at South Carolina's Myrtle Beach airport, though it would likely take at least until Monday for a near-normal schedule.

And in Fayetteville, North Carolina - one of the cities most affected by Florence - some flights began Sunday afternoon.

Overall, however, the cancellation tally from Florence continued to tick up. Nationwide, more than 3,630 flights had been canceled since Wednesday, with pre-emptive cancellations now stretching into Tuesday, flight-tracking service FlightAware.com counted as of 9:30 p.m. ET on Sunday. Most were tied to disruptions in the Carolinas from Florence.