It means the Non Imm O Visa with the A prefix (Non Imm O-A Visa)
O = Other (entry to Thailand 'other' than those listed in 1-14 of section 34 of the Immigration Act)
A = Annual (permits a stay of 1 year on entry as opposed to the 90 days on a basic Non O Visa)
Absolutely - wehat really matters is
1. The Airline (the pilots and crew in an emergency);
2. The Plane (comfort and safety);
3. The Price. Unfortunately most people look here first and do not even think about anything else, until they are on the flight and realise what a cheap ticket really means.
Perhaps if the government spent more time building protection for on-line commerce and less time trying to prosecute people for having 'Bad' opinions, then this sort of thing would be rarer.
Just a thought...