Nope. All of Southwest's flights are 737-300s, 737-500s, 737-700 (the most common) or a 737-800.
737
Southwest Airlines currently only operate Boeing 737 airplanes. There are several different versions of this airplane though, so the seat count can vary.
Southwest currently operates 544 Boeing 737 jets (as of September 30, 2009).http://www.southwest.com/about_swa/press/factsheet.html#Fleet
The primary users of 737's are Southwest Airlines Continental Airlines Ryanair Alaska Airlines
No, as at February 2013, Southwest does not fly out of the USA. It has purchased AirTran Airways and by absorbing its routes, will soon be flying to Mexico. It only has Boeing 737 aircraft in its fleet which are not capable of reaching Europe.
The 737 and A320 are quit similar as they are both rigid & sophisticated. The 737 is a huge success story, as it very poplular with 1028 ordered. The most successful two airlines in the world use only a fleet 737s, e.g. Southwest airlines and Ryanair. However none of these airplanes is "better" the the other, one might be better for an airline due to operating costs, but for the average person it does not make any difference. If the 737 is full of passangers it will be more economical than the A320 Fuel versers pasanger
Ryanair air only operates one type of aircraft - the Boeing 737-800 series (737-8as) variant
737 original: 737 100 737 200 737 classic: 737 300 737 400 737 500 737 Next generation: 737 600 737 700 737 800 737 900
Assuming you mean Alaskan Airlines, their fleet consists of: Boeing 737-900 Boeing 737-900ER Boeing 737-800 Boeing 737-700 Boeing 737-400 Boeing 737-400 Combi Bombardier Q400 Bombardier CRJ-700
The kulula.com fleet consists of the following aircraft (as of February 2010)Kulula FleetAircraftTotalOrdersOptionsPassengersNotesBoeing 737-200100118Boeing 737-300100148Boeing 737-400500162Boeing 737-800280185Deliveries between 2012-2015Total980
Ryanair only operate with one aircraft, which is Boeing 737-800.