American Express will buy the airport lounge-booking service for an undisclosed sum, handing exits to Concur and Founders Fund.

Payment services firm American Express has agreed to buy US-based online airport lounge booking platform LoungeBuddy, which is backed by travel and expense management software producer Concur, for an undisclosed amount. Founded in 2015, LoungeBuddy has developed a website and mobile app that is used by travellers to find, book and gain access yo airport…

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