[UPDATE, May 9: Travelport revealed that its MTT division is the developer behind the American Express Global Business Travel app.]

American Express Global Business Travel late last year uploaded a new itinerary-based mobile app to the iTunes store. It's working to release the app on other platforms this year.

GBT Mobile is available in English to U.S.-based travelers whose firms have enrolled. The company expects to add other countries and languages this year. The app includes upcoming and past itineraries booked through GBT agents or an associated booking tool, gate change notifications . . .

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