ABSTRACT
Oneofthemostdifficultdecisionsairlinemanagementsmustmakeiswhethertobuynew orusedaircraftandwhattype.Alternatively,theymustconsiderwhetheritmakesbetter financialsensetomodernizeolderaircraftalreadyintheirfleetortoacquireaircraftfrom theoutside.Manyadditionalfactors,includingthecostsassociatedwithengineeringand maintenance,mustbeweighed.Thefactorsareconstantlychanging,andtheirrelative importanceateachairlinedependsonthecarrier’sindividualsituation.
