At least there is some advance notice. On Feb. 25 I booked two business awards using US Airways miles to Southeast Asia for 90K each. Three days later the mileage went to 120K with no advance notice. This devaluation has been occurring since at least 1993 on all airlines. A problem with CO is that I rarely find an international business seat at what was the standard level. The past 5 years I used about a million CO miles for NW & KLM business award seats. Not once was I able to snag a seat on CO.