http://aa.com/content/AAdvantage/pro...ardTypes.jhtml
PlanAAhead
* Can be claimed for fewer miles
* Recommended when you are planning a trip in advance
* Subject to capacity controls and travel embargo dates
AAnytime
* May be claimed for any available seat in the designated class of service on any day
* Have no capacity controls, no travel embargo dates, no restrictions for when you fly (provided the flight is not sold out)