An accident happened recently to some people I knew related to density altitude. It made me start thinking a lot about density altitude and performance charts. I understand that we need to figure out pressure altitude in order to figure out takeoff and landing distances. Now when we are at high density altitude airports, do we use pressure altitude or density altitude. I am just wondering how density altitude comes into play with our performance charts. For example we are at X airport with a density altitude of 6,000 feet. How would we figure out the takeoff and landing distances at that airport. I understand pressure altitude and density altitude im just wondering how this would correspond in our performance calculations.