Southwest Airlines is gradually reducing the size of its Boeing 737-NG fleet as it phases in newer, more efficient aircraft like the 737 MAX series. The NG planes are less fuel efficient and more expensive to maintain, which pressures the airline to prioritize fleet modernization. The transition also supports lower emissions goals and improves passenger experience through quieter, more advanced cabins. By retiring older aircraft sooner, Southwest aims to align capacity with demand while cutting long-term operating costs.
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