Delta Air Lines and the Association of Flight Attendants are fighting over the company’s latest isolation guidance for their workers who test positive for COVID-19. On Friday, the airline sent a cease-and-desist letter to the union claiming they had posted “false and defamatory information about the company’s policies.” The union’s president, Sara Nelson, says that their statements were “truthful and accurate” and that Delta “was responsible for confusing workers.”
See "Delta Air Lines sends a cease and desist to the AFA union", Niraj Chokshi and Lauren Hirsch, The New York Times, January 12, 2022