Paul make a point that I hear a lot. Years ago, bizmen often drove to save $$$. A friend of Dad’s always left home about 1 AM on Monday and managed to cover a territory east to Ohio, south to Md and north to Maine without flying. He used up about 3 cars in 2 yrs going about 150k per year (cars didn’t last as long in those days). At the end of his career, air got cheap and easy, so he flew.
Today it is not the cost (which is actually fairly cheap in a historic inflation adjusted context), but the hassle that keeps biz folks out of planes. Traffic CAN be a prob, but generally a car is more reliable for trips under 6 hours. It does make for a tough work week, and friends in industry tell me that it is hard to meet the quota for calls, but that’s the way it is. I, myself have made several 500 mile plus r/t, same day trips in the last 6 weeks. As I get older, it is easier to get up at 2 AM and early AM traffic is nice. With a 2 hr ck in at Logan (BOS), and an hour to get there, I have a 3 hour head start on any drive.