Airlines canceled hundreds of flights for Thursday and again Friday as Hurricane Matthew pelted the Florida coast with high winds and heavy rain.
Airlines had already canceled 1,300 more flights scheduled for Friday.
Airlines often cancel flights before storms hit to prevent passengers from being stranded at airports and to keep their planes in position to recover after the bad weather passes.
The National Hurricane Center in Miami said the storm's maximum sustained winds had strengthened to 140 mph as of late Thursday morning and were expected to maintain their strength as the storm approaches the Florida coast.
Earlier in the week, several airports in the Caribbean closed, forcing airlines to cancel flights there.