Delta is doing several special event routes next year. Going the opposite way of the traffic they are intending to capture can be a great deal. Example:
They are doing 4 days of AMS-AUS nonstop in March for SxSw (3/8,3/9,3/14,3/18). Wife and I are taking advantage of it and escaping Austin for 9 days. We got RT Delta One for two for 140k SkyMiles and 130k Flying Blue Miles including an extra FCO-AMS segment on KLM on the return.