Originally Posted by kevino
Award availability can change several times a day. If you find something that may work, reserve it, but don't ticket. You can change it later.
To be more accurate, ANY availability - award or revenue, changes dynamically 24 hours a day, seven days a week, 365 days a year. It changes every second and there is no "set schedule." This is because airlines sell seats dynamically and have yield management systems that adjust inventory buckets dynamically.