Working fine for me now. I'm accessing it from within Thailand.

Edited to add:
The pages work fine including the mileage statement and other "active" pages.

Edited again to add:
Now it's not working. Apparently they have problem with the www.thaiair.com server which is hosted on a different server from www.thaiairways.com. The active contents and apps are on www.thaiair.com server.