As mentioned its the largest by floor area.

Titles are titles, sorta like tallest building, from top occupied floor, to roof, to antenna, flag pole, lighting rod etc.

Nevertheless, its always cool to say "Been there".

It would seem that this museum is closing this weekend :( (a rather shaky Babelfish translation of this page seems to confirm it)

I was rather hoping to see it when I return to Japan in December, but by then it will be too late ...

The measure here is by floor area, and the reason Nagoya wins is because the station has enormous towers on top which hold the offices of JR Central. So it totals out at something like 450,000 square meters.

Agreed that Shinjuku FEELS much larger, though I think GCT in New York has more platforms.

GCT has more platforms -- yes I believe it does way have more platforms than JR does, but I wonder if you added in the Keio Line, Odakyu Line, Seibu Shinjuku Line (it's a block away, might be cheating), and the multiple subway lines if that would still be true. What about the subway stations reachable by underground tunnel, would they count?

I'm glad I went there in February this year!
They had some really neat robot demonstations (like a robot that draws your picture based on taking a shadow photograph of you, plus lots of cute robotic animals). There was also a cool section of robot toys.

I guess they're closing because the locaiton they are in is probably the most expensive street corner of Nagoya - it's right in the middle of downton Sakae. I hope they relocate to a less expensive area and kep the cool exhibits for all to see.

JL codeshares with AA as part of the OneWorld Alliance, as such, getting to NGO isn't a problem. Best route is likely AA over the pond and then JL from NRT to NGO.

Since I started flying QF (to/from and in AU) and AA (here in the US), most of my international travel involves codeshares or transfers between OW carriers.