Professional Air Traffic Controllers Organization (PATCO) is a labor union in the United States, that is affiliated with the Office and Professional Employees International Union (OPEIU, AFL-CIO, CLC). It is certified by the NLRB and currently represents air traffic controllers who work in private sector air traffic control towers, and is actively organizing controllers nationwide. PATCO signed an Alliance Agreement with the Teamsters Airline Division on October 15, 2008. The union also includes hundreds of former controllers fired during the 1981 strike by the previous union of the same name. PATCO uses the Federally Registered Trade Mark original union's logo to strengthen its claim to the PATCO lineage.