I'd have to go with the 2 AC glitches and the wideroe deal. Last 3 trips to TLV combined cost less than $1k in airfare, and I was able to bring my wife twice, and my kid once. The Etihad glitch was huge, got to travel through Africa like I may never get to again. DL F glitch was amazing, but unfortunate timing didn't allow me to jump on it. Honestly, the best thing I discovered through DDMS was DDF.