From Longman Business Dictionaryload factorˈload ˌfactor [singular]TRANSPORT the number of seats on a bus, train, or plane that are occupied by passengers who have paid the full fare, used when calculating profitsPassenger load factor on international flights was 66% last year, down from 69% a year earlier.The break-even load factor (=the number of passengers needed to start making a profit) was 61%. → factor