I don't do as much business travel as I used to (we're more in to teleconferencing & stuff nowadays, plus I changed job function to corp C suite from M&A worker bee), but I have a bunch of miles banked that I keep active & use for upgrades & such. I've also a couple of filthy rich family members (& by filthy rich, I mean their own private plane for domestic & pretty much only BA F for international) who give me tickets once or twice a year from their milage accounts for long haul trips (& always CW or F).

I also have no kids, no mortgage & several friends & family members who like to travel, so in recent years most of my trips have been for leisure (8 weeks vacation allowance per year helps).