A FlyerTalk Posting Legend
Join Date: Sep 2009
Location: Minneapolis: DL DM charter 2.3MM
Programs: A3*Gold, SPG Plat, HyattDiamond, MarriottPP, LHW exAccess, ICI, Raffles Amb, NW PE MM, TWA Gold MM
Posts: 102,617
Do not assume that you can use any lounge at an airport. In particular, at NRT the UA lounge is in Terminal 1 and reasonably close to most Star alliance gates but also walkable and accessible for DL, AF, and KE flights. You cannot use it for JAL, Qantas, AA, etc. flights.
You need to either provide more details or do some research. For example, the PP website usually has specific information on the location of their lounges.