A strike vote is always just symbolic. Until it isn't. Not many airline unions get an opportunity to strike anymore. Once the NMB finally allows self help, a court or PEMB always seems to force the union back to work in a matter of days, if not hours. Can't have the traveling public or American business handicapped.
Which is why the Teamsters actually have a legitimate strike threat. Since DHL is a German company, if a strike eventually happens, management will have less pull than a comparable US corporation would.
Atlas could be the largest airline to be allowed to _stay_ on strike in our lifetimes.