If you are looking for airfare to international cities and you don't get notices from Delta you should check out their website today. They are having a 24 hour sale and we were able to save about $193 per ticket for flights in March/April for our trip to Germany compared to what I had been pricing. The travel period "may begin December 9–December 12, 2013 or January 9–March 27, 2014, and all travel must be completed on or before April 27, 2014". This sale only applies to trips that are minimum of 10 days, which doesn't help those going for shorter periods.
Just thought I would pass this along as for us it was a great price. This was even $103 cheaper than what we paid for last year around the same time to Germany.