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
"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
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