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Continue to ChatEngine makers may face stiffer future ETOPS certification requirements https://leehamnews.com/2018/04/23/engine-makers-may-face-stiffer-future-etops-certification-requirements/
Engine makers may face stiffer future ETOPS certification requirements https://leehamnews.com/2018/04/23/engine-makers-may-face-stiffer-future-etops-certification-requirements/