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Simple Flying
When you’re at a US airport, you may have noticed that some of the newest 737s in United’s, American’s, or Southwest’s fleet have serrations on the back of the engines. This feature is new to the Boeing 737, and it’s one of the few visual differences between the MAX and its predecessors. This distinctive design almost looks like shark teeth, leading some to wonder why there are spikes at the back of the plane’s engines.