Major failure of one of the FAA's two centers for processing flight plans, NADIN/Atlanta. They have a parallel site in Salt Lake City, which is taking the load for both, slowing everything down. No terrorism - the same kind of thing happened last year. They just need better backups.
The FAA's normal flight status website is overwhelmed with web traffic as of this writing, just when people need it the most. NATCA, the FAA's controllers union, also has a delays website, which doesn't seem to be faring much better as to information. Flights can be tracked free online here. Good luck out there.
UPDATE ...from Atlanta..