Denmark-based shipping and oil conglomerate Maersk appears to be one of the few companies building its own mobile corporate travel app. In an October discussion with Business Travel News, Mette Christensen, the company’s global head of travel and indirect services, said nothing else out there fit the bill.

The idea prompted a challenge from Jeroen van Velzen, co-founder and CEO of Dutch mobile tech firm Roadmap. "If you were to build our stack delivering the same functionality . . .

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