The 2012 reference is this incident
http://www.cnn.com/2012/06/26/world/meast/turkey-syria-plane/
Just noticed this quote
“Erdogan criticized Syria harshly on Tuesday for shooting down the Turkish fighter jet, saying: “Even if the plane was in their airspace for a few seconds, that is no excuse to attack.”
“It was clear that this plane was not an aggressive plane. Still it was shot down,” he said.”