https://en.wikipedia.org/wiki/Gerald_R._Ford-class_aircraft_carrier
La catapulte
Electromagnetic Aircraft Launch System
Main article: Electromagnetic Aircraft Launch System
The Electromagnetic Aircraft Launch System (EMALS) launches aircraft by means of a catapult employing a linear induction motor rather than the steam piston used on the Nimitz class. The EMALS accelerates aircraft more smoothly, putting less stress on their airframes. The EMALS also weighs less, is expected to cost less and require less maintenance, and can launch both heavier and lighter aircraft than a steam piston-driven system. It also reduces the carrier’s requirement for fresh water, thus reducing the demand for energy-intensive desalination.[44]