John Dudley contends in a federal court lawsuit that Lucas, who was an executive producer of the 2012 film, co-writers and the director ripped 80 percent of their movie from a screenplay he'd registered with the Writer's Guild of America in 1998.
That screenplay was also titled "Red Tails," a name used by the African-American fighter pilot group.
The Spokesman-Review reports that Dudley works as an attorney for the federal government. He says he wrote 14 screenplays in the mid-'90s, the last of which was "Red Tails."
No trial date has been set in the case.