My company permits me to buy US miles, and expense them because we are frugal, but they still grasp the fact that I prefer business class to economy class. But, I realize this isn't an option for many people who are locked into corporate travel contracts. That having been said, if it is for you, business class (on pretty much every airline in the world) is superior to Y+ on DL, and $2000 is a very nice RT price (e.g. this summer, China-USA was running at around $2000 one way in Y).