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Passage 5 International airlines have rediscovered the business travelers, the man or woman who regularly jets from country to country as part of the job. This does not necessarily mean that airlines ever _1_ their business travelers. Indeed, companies like Lufthansa and Swissair would rightly argue that they have always _2_ best for the executive class passengers. But many lines could be accused of concentrating too heavily in the recent past on attracting passengers by volume, often at the _3_ of regular travelers. Too often, they have seemed geared for quantity rather than quality. Operating a major airline in the 1980s is essentially a matter of finding the right mix of passengers. The airlines need to fill up the back end of their wide-bodied jets with low fare passengers,without forgetting that the front end should be filled with people who pay_4_ more for their tickets. It is no _5_ that the two major airline bankruptcies in 1982 were among the companies _6_ in cheap flights.but low fares require consistently full aircraft to make flights economically viable(可行的), and in the recent recession the volume of traffic has not grown. EquaUy the large number of airlines jostling for (争夺)the _7_ passenger has created a huge excess of capacity. The net result of excess capacity and cut-throat _8_ driving down fares has been to push some airlines into _9_ and leave many others hovering on the brink. | 
