FARNBOROUGH, England—Rolls-Royce engineers are developing miniature robots that could be used in future jet engine maintenance applications.

FAIRFIELD, CT—A metal sensor housing has become the first 3D-printed part certified by the Federal Aviation Administration to fly inside a commercial jet engine.

WINFIELD, KS—GE will produce its new Passport 20 jet engine at the company’s assembly plant here. The engine will power business jets produced by Bombardier.

MIDDLETOWN, CT—Pratt and Whitney unveiled a new state-of-the-art assembly line here. The horizontal assembly line suspends the engine from the ceiling, so it can move up, down and around, instead of the workers having to do all that. The assembly line will make engines for the Airbus 320 Neo passenger jet and the F-35 joint strike fighter.

The bald eagle is a majestic symbol of power and freedom. It’s also the logo of one of America’s oldest aerospace manufacturers: Pratt & Whitney.

FAIRFIELD, CT—Scientists at GE are experimenting with a technology, called Direct Write, that uses special “inks” to print miniature sensors directly inside jet engines, gas turbines and other hot, harsh and hard-to-reach places.

INDIANAPOLIS—Rolls-Royce has opened a new, $42 million assembly plant here to make components for military and commercial jet engines.