The concorse B expansion will not happen for another 10 years or so, because of the number of flights at XNA. Concorse A still has empty gates that no airline is using, so until all gates are occupied in A there is no need for the west side to be the as the east... All though it would be nice. Allegiant has been testing flights from XNA to Fort Lauderdale, and Tampa for a while to see if there is demand for that flight, which there is. But they have not decided whether or not if they should want if should be a seasonal route or year round. With all this tremendous growth happening, I would not be surprised at all if a new airline annocuned its highly awaited arrival to XNA.