I just used it to save an itinerary - am a iK if that matters.

But i have noticed in the past that it sometimes doesn't work if you are trying to hold a 14 day advance purchase fare for purchase on the 13th day, if you understand what I mean. To see if this is the case, try it out - see if you would be able to hold the same itinerary for the following day - the day AFTER you really want to travel...and if so, you are probably trying to hold a fare that is going to expire...