May book a flight w/ United/ ANA to Tokyo and BKK. One option allows for ANA and United, but only a little over two hours to change. Another option n w ANA gives just the legal minimum of 45 minutes. Do both carriers arrive n depart in the same terminal for international flights? ? It would be BKK to NRT w ANA then NRT to LAX. Please advise. This is for the return portion. No probs w/ outbound since I will stop 3 days in Tokyo.