Don’t think density altitude had anything to do with it. One report was the plane was on fire before it hit. DA deals with high elevations and high temps and humidity. Birmingham is at 600 feet.
It’s good to know exactly where the ground is when landing.
I’ve seen the density altitude at Pensacola, FL calculated at 3000 feet. P’cola is on the Gulf... just a little above Sea Level.
Play around with this calculator to see for yourself.
http://wahiduddin.net/calc/calc_da.htm