https://aviationweek.com/themes/custom/particle/dist/app-drupal/assets/awn-logo.svg Airlines are still learning about the reliability of new-technology engines—and how many spares they need. Credit: Lufthansa Technik Spare engines provide both operational and financial flexibility for airlines. Their primary role is to keep aircraft flying when standard engines are undergoing overhaul or are out of service for other reasons. Accordingly, demand for spare engines rises during busy maintenance periods and falls.

https://aviationweek.com/mro/aircraft-propulsion/strategies-spare-engine-shortage

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