"Is this now the new frontier airlines???" said one Southwest flyer on X.

Southwest Airlines replaced open seating with assigned seats after more than 50 years.

Starting Tuesday​, customers on Southwest flights will have assigned seats.

For a large person, each flight on Southwest was a game of roulette under the airline's longtime unassigned seating policy.

The carrier has claimed that its customers prefer the new policy, despite some pushback.

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