Originally Posted by SFO777

Minimum connect time (90 minutes) doesn't matter on separate tickets. Although both flights will operate from Terminal 1, 75 minutes is way too risky. You will have a 10 minute walk from the TG gate and then long queue with the masses to go thru international transfer security, and then a long walk to your NH flight. You would need everything to go right. The day I flew, TG departed BKK and arrived NRT 25 minutes late.