Only Siemens globally appointed travel management agencies are allowed to be used, in China, it is Carlson Wagonlit (CWT).

机票必须通过西门子全球指定的差旅管理服务公司购买，在中国即：中航嘉信。

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The warnings appear to have had little effect, according to Mauricio Baranda, Mexico country manager at Carlson Wagonlit Travel.

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His core holding, WorldTravel Partners, is poised to surpass Carlson Wagonlit as the second-biggest travel group in the U.S. after American Express.

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Through Carlson Wagonlit, the group is one of the world's biggest corporate travel managers, looking after companies like General Electric and Coca-Cola.

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