Distance and placement are different. SJC and SFO are both south of San Francisco. LAX and ONT, on the other hand, or on opposite sides of (the center of) Los Angeles. HND is actually closer to Tokyo than NRT, but is domestic focused and so has completely different connections. (And connections, for AA, is a huge difference between LAX and ONT as well.)

Is VCP useful for LANTAM connections, or is it an alternate airport for O/D traffic only?