Delta Air Lines is a major American airline headquartered in Atlanta, Georgia. It is one of the largest airlines in the world, serving more than 325 destinations in 52 countries on six continents. Since 1929, the Delta logo has undergone numerous redesigns, with a total of 18 revisions as of 2012.
The current logo, which debuted in 2007, combines an all-caps sans serif logotype with a three-dimensional widget in solid red. The typeface is extremely similar to Dino dos Santos's Priva Four. The font is a commercial one and you can view more details about it here.