Sales
Technical support for high end equipment (big network routers, power gen systems, specialized industrial systems, etc)
Mil HQ staff
Media/marketing production
etc, etc

Some jobs are on the road by definition (oil, construction, consulting, training).

I could go on and on. I actually got interested in airlines while doing white collar biz travel, and noticed that after getting up at 0300 and traveling across the country the flight crew headed to the hotel, while I headed to a long workday. Got me thinking.

In order to make major airline pay in white collar, you will be traveling and/or working very long hours, and in the modern era pretty much available at all hours via email, text, etc. You do typically get holidays off, so there's that.