Price drop has more to do with being over 30 days out than anything else. If you book within 7 days it would be highest. Always book as far in advance as you can to get the lowest price. I fly to San Juan, PR once a year and pay a lower price for first class tickets by booking several months in advance than someone else pays for coach who does not book until the last minute. The down side of this is that if your plans change you will get hit with change fees plus fare increases. This system has been around for years.