Fly high with Southwest (NU) Airlines and witness what the world looks like from above the clouds. www.globester.com makes it an easy task for you as you have access to great deals. If the expense of the trip is what is eating your thoughts away, then be assured as we at Globester take care of that too. Southwest is the worldâ??s largest airline in terms of the number of passengers it carries. It also brings to the forefront the fact that it is a reliable and money-saving option. It is a low-fare airline based in Texas, and currently serves 64 cities in 32 states. Southwest Airlines operates solely within the United States. Instead of flying to the principal airports in some larger cities (most notably Houston, Dallas, New York and Chicago), Southwest chooses to use secondary airports or cities.