Now when One Two Go is banned for a while you might think it is safe to fly, but think again. Being approved in one country does not mean they meet up with the safety regulations in EU for example.
EU has much stricter guidelines and rules for the airline then Thailand and other Asian country and you should checked this list of this airline that are banned to fly to EU.
Phuket Air was banned from flying to EU for a while ago and there is some other Thai and Asian airlines on the list as well.