Southwest announces a revolution, will be the first momentous change in 40 years
You either hate it or you love it, and I personally love it, Southwest invented the low-cost business model copied [...]

You either hate it or you love it, and I personally love it, Southwest invented the low-cost business model copied by so many other carriers around the world, Ryanair could be said to have taken a cue and Then implemented the exact opposite strategy.
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I have explained in many ways why I consider this company the best LC in the world, and one of the reasons is also its never-changing business model. While other carriers, traditional and low-cost, have in recent years tried to milk the passenger more and more by inventing the worst surcharges, the big-hearted airline has never pursued this path.
You don't pay for a seat on board, for boarding your luggage, for trolley or for priority boarding. In short, it really is a company that always puts the passenger at the center, despite the fact that they too have had several screw-ups related to 737max, technology failures, and problems with staff.
What's about to change for Southwest passengers
At the moment it is only speculation that started with some statements at a public event, but it would seem the day has come when something aboard the blue-livered planes is set to change.
In recent months the American airline, which has a fleet consisting solely of 737s of various versions, has announced the installation of new cabins aboard its new planes and the retrofitting of those in service. Now it is letting slip statements that hint at the installation of seats with more space.
There will be no change to business class seats or anything like that, but it is likely that responding to a market demand Southwest will introduce rows of seats with more legroom. Today all seats, except those near the emergency exits or the front row, give inches to passengers and are not sold extra, but available to anyone since the seat is not assigned, but the seat is free.