As SkyCruiser pointed out, NRT
will be a 777 from now on. This is not a seasonal change or temporary; schedules as far out as Jan07 still show the flight as a 777. Looking at the seat map, it seems to be a Pacific 777 with crew rest for pilots behind the cockpit which means that the flight will be operated by N209UA, N216UA-N229UA.
Aircraft arriving 4May should be N221UA.
Boeing 777s flown: UA, TG, KE, BA, CX, NH, JD, JL, CZ, SQ, EK, NG, CO, AF, SV, KU, DL, AA, MH, OZ, CA, MS, SU, LY, RG, PE, AZ, KL, VN, PK, EY, NZ, AM, BR, AC, DT, UU, OS, AI, 9W, KQ, QR, VA, JJ, ET, TK, PR, BG, T5, CI, MU and LX.. Further to fly.. LH 777