United Airlines merged with Capital Airlines on June 1, 1961, and became the world's largest commercial airline, and gave it a route network covering the entire United States. In 1968 the company reorganized, creating UAL Corporation, with United Airlines as a completely owned subsidiary. United Airlines had begun to seek overseas routes in the 1960s; however the Transpacific Route Case (1969) denied it this expansion. United Airlines did not gain an overseas route until 1983, when it began flights to Tokyo from Portland and Seattle. In 1985, United Airlines agreed to purchase Pan American World Airways' entire Pacific Division, and by the end of 1986, United operated flights to 13 Pacific destinations. Book Cheap Airline Tickets to USA by United AIrlines and get cash back and discounts on every booking.