To compete with a merged Delta and Northwest, and forge a strong and stable American airline industry, United and Continental or American and us Airways may be urged to make a similar move.

为了和合并后的三角洲和西北竞争，打造一个强大稳定的美国航空业，联合航空和大陆航空，或者美国航空和全美航空，可能不得不采取同样的策略。

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The airport's four big incumbents, Delta Air Lines, US Airways, American Airlines and United Airlines, will each exchange an inside-perimeter flight for a longer one.

ECONOMIST: Airports in Washington, DC: Breaching the perimeter | The