The first time you entered, you came by bus through the Aranyaprathet-Poipet border, hence the slight scrutiny. When the border was open, I also re-entered through there once, but by car (which is different). If you use public transportation, the upstairs immigration is known for being strict. Any other border is usually OK.
Anonymous participant 949It's very very unlikely you'd need to show any such docs if you're on a DTV. Never heard of anyone being asked for such proof. Verbal proof, maybe but not documented proof.
A. Nony Mous My friend said it was because it was mainly Cambodians and other brown foreigners pulled aside...however, it doesn't mean this happens everyday.
Still, Suvarnabhumi is way better...not worth flying Air Asia (which frankly isn't likely to be any cheaper than a full service carrier on a short haul route anyway) especially if it may come with less friendly treatment once you arrive at the airport.