Although I'm not travelling much with my firm (large brokerage company) we have a small group of traveller who spend Mon-Fri each week out on the road. We are pioneering a new form of financial planning and so they visit our various branches informing the financial advisors of how it all works. We have a couple of guys based on the east coast and one lady who lives in Phoenix.
My father has worked in software for as long as I can remember and has travelled far, wide and fairly often. Living in the UK he used to spend one week on, one week off, splitting his time between Orange County, CA and the UK. On his weeks back in the UK he used to spend perhaps a couple of those in Europe. Now he co-ordinates a team spread across the Benelux countries, France & Spain. Flies about two days a week.