[pyalot2]

Modern airliners are also flown by entire teams of ground crews, among them Rolls Royce support engineers that monitor an aircrafts engines in realtime every second of operation trough its entire lifespan trough the hundreds of sensors embedded in each and every engine.

This way, most problems an engine would develop that would be hard to spot by ground service, are detected and acted upon long before they threaten the operation of the engine and airplane.