DFR lawsuits aren't exactly uncommon, especially in the aviation industry.

The plaintiff's success in such lawsuits, however, is wildly variable.

Best as I can tell, the pilot was a conspiracy theorist and a 9/11 truther, and claimed Boeing made "unsafe and illegal modifications" to their airplanes (with subsequent "vaporization" of two airliners somehow proving his position).

Because of these opinions NWA made him undergo a psychological evaluation, and when he didn't show for that appointment, he was terminated.

I'm no lawyer, but given the amount of subjective opinion in the "Factual Background" that likely cannot ever be proven I doubt the Plaintiff will win any damages...