That's true BlondeBomber. While in terms of eligible fares, US is the most generous, but then it's only good for one round trip. I suppose the only way one could clean up is by earning Silver, get the kit, then earn Gold, get the kit, then earn Chairman's Preferred, get the kit.

While US carriers in general have a more liberal upgrade policy, AC makes up for it by including lounge access. The value in that alone can be as high as US$450/yr.