The Air Line Pilots Association, Int'l (ALPA) is the largest airline pilot union in the world, representing more than 61,000 ... pilots at 38 airlines in the U.S. & Canada. . For more information, visit http://www.alpa.org. Founded in 1931, the Association is chartered by the AFL-CIO and the Canadian Labour Congress. Known internationally as US-ALPA, it is also a member of the International Federation of Air Line Pilot Associations (IFALPA). read more