Southwest Airline, profitabel 46 years in a row coming?

I am looking for research about the Southwest airline. It has been profitable 45 years in a row, I want to know is the 46th year coming or not. First, what is the profit model for southwest, second, why is this model could for so long? third, why nobody could copy this model? fourth, what is my opinion about this model? how to improve it.

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