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This question already has an answer here:

If you look at the engines of an A350 and other similar aircraft, you will see that their engines stick out ahead of the wing. Why? Why aren't they tucked under the wing?

enter image description here
(Source: Airbus)

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marked as duplicate by fooot, Pondlife, Community May 18 '17 at 16:58

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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To bring the Center of Mass forward, and to be able to raise the jet engines, which then permits shorter and lighter landing gears.

This is what the 737 did when it moved to the bigger CFM56 engines:

Old vs new:

enter image description here
(Top, bottom)


Related: Why do we use pylons to mount the engines on jetliners?

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