Join Date: Dec 2004
Location: Riding the rails
Programs: Japan Forum, Skyteam Elite Plus, BW Diamond Select, HHonors Gold, NWA, DL, NH
Posts: 1,936
I often arrive at the Airport 2-3 hours early on international flights out.
Check-in, security, exit immigration, can be long at times.
Since it takes 1-2hrs to get to Narita Airport from Tokyo, I'd leave somewhere around 11am.