just did the airport train trip today too.....and lis is spot on. I believe it opened on 31 August. Trains every 15 minutes....clean and cool, and only 15 baht to Phaya Thai interchange station The trip takes 27 minutes. This station links with the Skytain, and another 15 minutes later (and another 25 baht) , I was in Nana. In total less than 45 minutes from the airport. Recommended!!