Modern jet aircraft have roughly the same glide characteristics as a brick if all the engines stop. Even one engine out is a flight emergency.
To add to what unimogbert said, modern commercial aircraft are designed to maximize lift and minimize drag for fuel efficiency. This also maximizes their glide performance.
One engine going out is considered an emergency because if you don't know
why that engine quit, you don't know if the others are about to quit, too. So you want to get that plane back on the ground as soon as you can.
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