Originally Posted by
toni8284
So how hard to find C (business) seats (4 seats) in 1 time?
I thought the best is 2 seats opens at a time?
It is believed that among NA routes, only NRT-IAH(4C),NRT-ORD(4C),NRT-MEX(4C) have 4 seats availability for an ordinary member.
A blogger summarized its investigation in web page(In Japanese, but airport codes are indicated, you get some idea)
https://www.uridayo.com/entry/award-avaialblity