Several flights in and out of the Savannah-Hilton Head International Airport are reporting ... but these are still in stock READ THE FULL STORY:Flight Tracker: Savannah-Hilton Head airport reports ...

The British government recently announced it would require armed undercover marshals on some international flights. The union opposes the rule, saying flying with armed marshals is dangerous.

The airport, which is one of the busiest in the world, is expected to remain closed until midnight on Friday (21 March), with more than 1,350 flights delayed or cancelled.