A private pilot is licensed to fly for pleasure or business. This is an entry level license, which requires less than 100 hours flight time and demonstration of basic knowledge and skills.
A commercial pilot can fly for hire. This would include instructors, crop dusters, glider tow pilots, and some charter pilots. It requires more than 200 hours flight time and more basic knowledge and skills.
An air transport pilot can fly airliners. This is a much more complicated license requiring a more stringent physical examination, and some very demanding flight examinations. Each airliner a pilot flies requires a type rating.
There are other ratings pilots can obtain, including an instrument rating and a multi-engine rating. Pilots may also obtain glider ratings if they are so disposed. A commercial glider pilot would likely be an instructor. There are also certified flight instructor ratings of various types.
That's more than you asked for. Sorry. It's been a while since I've had to deal with these things, so I am not up to date on the numbers of hours for each rating, but I think you could find those in wikipedia if you need them.
By the way, I hold a commercial pilot's license with an instrument rating, but am not currently flying. A license is not valid unless you also have a valid medical certificate. So my license and rating are not valid at this time.
The main difference between American and Thai airlines will be the different routes the airlines take. While American airlines will have many national and international flights around the US, Thai airlines, as it is smaller country will have few national flights but many international flights due to the nature of the holiday tourism in the country.
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A national bank does business on a national level, for example deals exclusively with in-country clients. A commercial bank will fund foreign deals and has dealings outside of the Federal Reserve system of America.
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Domestic Airlines fly nationally (inside one country, such as New York City to Denver) and International Airlines fly internationally (from one country to a different one, often times overseas, such as New York City, USA to Frankfurt, Germany).
Domestic awards are typically given within a specific country or region, recognizing achievements or contributions within that local context. International awards, on the other hand, have a broader scope and recognize achievements on a global scale, often drawing nominees and winners from around the world.
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