西南航空以1.572亿美元的辅助服务收入居于美国航空公司辅助收入排名中的第四位，数据来源于在5月3日由美国交通统计局（U.S. Bureau of TransportationStatistics）发布的数据年鉴。
At $157.2 million, Southwest came in fourth among U.S. airline ancillary-fee collectors, according to a tally released May 3 by the U.S. Bureau of Transportation Statistics.
根据来自美国交通运输管理局的数据，通常美国国内航班的一趟往返机票的平均票价是361美元。
The average domestic round-trip airline fare in the U. S. is $361, according to the Bureau of Transportation Statistics.
根据来自美国交通运输管理局的数据，通常美国国内航班的一趟往返机票的平均票价是361美元。
The average domestic round-trip airline fare in the U. S. is $361, according to the Bureau of Transportation Statistics.
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