What counts is not the size of the airline, but the interest in them within the Flyer Talk population.
Obviously this board is dominated by English, so you will see more interest in US airlines, other English speaking countries, and the EU (as they are closely tied, regardless of language).
I have seen a definite uptake on threads related to MU, CZ and Ca though. So maybe it is time for a board of China based airlines. If it includes BR and CI, I think it would clearly have more interest than many other boards.