I only travel 2 to 3 times a year, and usually one of these trips is international. In the past, I have always just booked with the cheapest airline; however, this has lead me flying with many different carriers. This fall I am planning a trip to Las Vegas, but this trip will also be followed by a trip to Thailand. Would it be worth my wild to start booking with the same carrier? Also, is it worth paying more for a flight to have it with a specific carrier? My trip to Thailand has a roundtrip ticket of $1,500 flying Delta and Korean Airways, but $1,700 fly with a carrier with Star Alliance. Would it be worth my time and money sticking with someone in the Star Alliance program?