Air Asia are a low fare airline originating in Malaysia that can really make your holiday money go further without needed to sacrifice quality.
Air Asia offer a selection of domestic and international flights within Thailand, Indonesia, Macau (Greater China), Singapore, Philippines, Cambodia and Vietnam.
Air Asia was heavily in debt when a former Time Warner executive quit his job and took up the challenge or turning the company around. Tony Fernandes has now turned Air Asia is now an award winning airline by using Ryanair as a template for a low cost airline.
Air Asia operate a fleet of Boeing 737-300s that are reliable and comfortable to fly in.
As with most low cost airlines, Air Asia do not provide free meals or drinks, but there is a reasonably priced catering service (for airlines).
You can book online and provide your name and will receive a receipt, much like a shopping docket, functions as your boarding pass. I find this to be the most convenient method, although you can also book Air Asia via walk-in airport sales stations, sales offices and travel agents.
The way the fare system works, is that seats start out cheap and get more expensive as they are filled. Obviously this means that you should try to book as early as possible, because you are more likely to get a cheaper flight. This also means that less popular days or times will likely be cheaper options. Also note that any holidays are likely to be pretty busy and getting a cheap flight, or even a flight at all may be a problem.
Note that on some of their flights there will be a mad rush for the check-in desk when it opens. I think this is so people can get a good seat as these are not reserved when you are given your ticket. It is somewhat comical to watch as grown people run like kids to be the first in line. I'm not sure what all the fuss is about. It would be most unlikely for your baggage to beat you to the baggage pickup area no matter what seat you were sitting in.
Air Asia are definitely worth checking out if you are travelling around Asia.