6 to 12 weeks in advance according to this reservation agent. "IAMA Delta/KLM/Air France reservation agent that knows all the tricks to booking low fares and a

6 to 12 weeks in advance according to this reservation agent. "IAMA Delta/KLM/Air France reservation agent that knows all the tricks to booking low fares and award tickets AMA" http://www.reddit.com/comments/v82rz/c524yi7/?sort=best http://www.reddit.com/comments/v82rz/c524yi7/?sort=best