Now there are few big network airlines left to be nabbed.

现如今剩下的几家拥有大型航空网络的航空公司成了抢手货。

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And low-cost carriers are piling pressure on network airlines in America, Europe, Asia and South America.

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"They're all trying to move that route, but it's a little harder for the higher-cost network airlines to tack on higher fees associated with getting passengers from A to B, " Cordle said.

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Southwest Airlines pioneered the low-cost model which enabled it to offer fares that were significantly lower than those charged by traditional network airlines such as Delta Air Lines, US Airways, American Airways, and United Continental.

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