Delta Air Lines is a provider of scheduled air transportation for passengers and cargo. It is the United States' oldest operating airline and the seventh oldest operating worldwide. Delta, along with its subsidiaries and regional affiliates, operates over 5,400 flights daily and serves 325 destinations in 52 countries on six continents. The company serves over 800 destinations in about 130 countries, and it operates a mainline fleet of 1,200 aircraft, as well as maintenance, repair, and overhaul (MRO) and cargo operations