Jet engines seem built to last forever, but their real lifespan depends on a lot more than just age, including how they're flown, maintained, and monitored.

Gravity Industries' Jet Suit uses advanced microjet engines to let a pilot fly with wearable turbine propulsion.

A modern jet engine is a complex mechanical wonder. However, these aren't engines that will just roar into action with the turn of a key or the press of a button. Often, turbine engines will need ...