Los Angeles is a hyper-competitive market. There’s no more high revenue market than New York – Los Angeles, with New York – San Francisco following it.
That’s why the routes are so competitive, not just with so many airlines offering service but also with a better product than what’s offered domestically on other routes.
United is introducing 3-cabin Boeing 777 service between Newark and both Los Angeles and San Francisco and between Washington Dulles and those two cities.