Clearly they cater to both local Thai's and Westerners vacationing in the land of smiles.
So even though it is 1800 seats, 1000 of these are still pretty close enough. http://www.adia-shoninsya.com/%e3%83%8b%e3%83%a5%e3%83%bc%e3%82%b9/%e4%bb%8b%e8%ad%b7%e8%81%b7%e5%93%a1%e5%88%9d%e4%bb%bb%e8%80%85%e7%a0%94%e4%bf%ae%e3%82%b5%e3%82%a4%e3%83%88%e3%82%aa%e3%83%bc%e3%83%97%e3%83%b3%e3%81%97%e3%81%be%e3%81%97%e3%81%9f%e3%80%82/