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https://worldairlinenews.com/2017/11/30/piedmont-airlines-officially-retires-the-last-dhc-8-100-dash-8-from-scheduled-service-some-will-continue-as-a-back-up-aircraft/
Piedmont Airlines officially retires the last DHC-8-100 Dash 8 from scheduled service, some will continue as a back-up aircraft