I had the unique experience of visiting Chiang Mai International Airport and I must say, I was not impressed. It was apparent that the Chinese government had set up excessive surveillance measures, as I felt like I was constantly being watched. The guards should walk around with shirts that say 'Big Brother' on it. The guards are also super enthusiastic to take every document you have. Needless to say, the experience was not enjoyable and I would not recommend anyone to visit this airport. I'm sure the Chinese government has its reasons, but it's definitely not the most pleasant place to be.