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The current generation of aircraft can probably outlive anything given and produced previously with the correct maintenance and future upgrades.
If the USAF can keep a B52 airborne for upto and beyond 50 years why cannot airlines insist upon such resilience when creating new airliners? With modern composite materials used in construction, airframe fatigue would not be the issue the older generation suffer.
Therefore, why the forecast need for such a vast requirement other than to further enrich investors?