Late last year, when we spoke to executives across the corporate travel industry about the year that was coming to an end, one theme that came up again and again was how much uncertainty the industry had to cope with.

At the time, we said: "Business travel rolled with a whole lot of punches in 2016. Buckle up for next year."

That was good advice. Some of the previous year's uncertainty was gone, but there were many new and unexpected developments in the U.S. and overseas, as well as lingering questions over earlier disruptions such as Brexit.

Our contributor Amy Merrick posed questions to several executives about corporate travel in 2017 and wrote about the highlights, surprises, and challenges they discussed.

Speaking of the end of 2017, this newsletter will take a break next week for the holidays. Business travel editor Andrew Sheivachman will return the first week of January for more of the corporate travel news you've come to rely on.