November 11th, 2015: Here's a link to this problem being discussed, if you want to be prepared for this VERY LIKELY eventuality!! – Ryan
December 5th: Last day that ALL US shipping methods are safe.
December 12th: Last day that to use USPS Priority or Express for international orders!
December 13th: Only USPS Priority Express or FedEx 2- for guaranteed Christmas delivery.
December 18th-December 19th: FedEx 2-Day and Overnight might work, but no promises!!
Here that is in GRAPHIC FORM!