ATLANTA - Storms extending from the Gulf Coast to the Northeast caused hundreds of flight delays for travelers trying to get home for Christmas.

Long lines filled concourses at Hartsfield-Jackson Atlanta International Airport on Thursday, and flight status boards showed multiple flight cancellations.

FlightAware, a website that tracks airline flights, showed 550 flights had been canceled nationwide with 4,276 delays by midday. Atlanta had the largest percentage of delays, according to the site, but many flights also were late in New York and Washington, D.C.