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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In key European markets, high-speed rail ticket prices are predicted to rise by more than 4% next year due to its popularity over air, according to forecasts by Carlson Wagonlit, a global travel management company.

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In light of the travel advisories by the American and British governments, Cyrus Guzder, chairman of travel firm Carlson Wagonlit Travel India, worries that the high tourist season that is just beginning will see a raft of cancelations.

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For instance, sister company Carlson Wagonlit Travel is one of the world's largest travel agencies, but China forbids foreigners from providing travel-related services, so Carlson is paying a Beijing destination management company, Pacific World, to handle much of what it could do itself.

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