Hamburg, Berlin, Frankfurt, Dusseldorf are all on sale! Some routes do include the Thanksgiving holiday. Dates are generally November, early December, all of January and February, March, and the first half of April.
These are great prices and routes from the XNA airport. They are with major airlines like KLM and Delta.
LINK TO BERLIN FLIGHT
LINK TO DUSSELDORF FLIGHT
LINK TO HAMBURG FLIGHT
LINK TO FRANKFURT FLIGHT