Another was the new Pratt & Whitney turbofan engines, which burned more fuel than expected; by the time CFM International (CFM) had a more efficient engine ready for market, many A318 customers had already backed out, including Air China and British Airways.
Ett annat problem utgjordes av de nya Pratt & Whitney turbofanmotorer som brände mera bränsle än väntat: vid denna tidpunkt hade CFMI en mera effektiv motor ute på marknaden, många A318-kunder hade redan backat ur, däribland Air China och British Airways.