My guess is one of these obnoxious white Democrat union types that are still out there. They are always angry right now because unions are supposed to support Democrats, but they see a lot of their peers supporting Trump, which only makes them angrier and more bitter.
I’ve seen a ton of guys like this in my day. Real a-hole.
A lot of people seem to get drunk at the airport and then act out in the air.
A reminder that this is Washington Dulles airport. He might be a fired federal employee and mad at the world. By the time this hits the MSM they’ll airbrush his hat red.