Concur, which has more than 22 million customers around the world, touts itself as an “easy-to-use business travel and expense management” software. “We’re seeing Airbnb going from zero two years ago to $1 million this quarter” in corporate expense reports, MacDonald told CNBC.

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Although Airbnb lays claim on just 1% of the market share so far, “it’s the rate of growth that is eye-popping,” he added.

MacDonald said that cities in dire need of more hotel rooms are prime places for Airbnb to continue to grow. “There obviously is a real need otherwise business travelers wouldn’t be going there,” he said.

“I would expect all the sharing economies to see a pickup,” said MacDonald. “We know anecdotally that the ride-share companies are seeing tremendous growth in the business sector. It’s a changing dynamic in the travel industry.”