Add Yahoo as a preferred source to see more of our stories on Google. Has density altitude affected your flight plans recently? Do you plan for it when you create those summertime flight plans? I ask ...

Every commercial flight carrying passengers at 35,000 feet operates in air roughly one-quarter as dense as the atmosphere at ground level, a physical reality that directly shapes how much fuel ...

Has density altitude affected your flight plans recently? Do you plan for it when you create those summertime flight plans? I ask because as I write this column Seattle is under a heat advisory.