Delta celebrates 80 years of passenger service. Announces expanded trans-Atlantic joint venture with Air France-KLM. Becomes the only U.S. airline to serve six continents with introduction of nonstop flights between Los Angeles and Sydney, Australia. Completes integration of Northwest WorldPerks frequent flyer program into SkyMiles, creating the world’s largest loyalty program with more than 74 million members. Rebrands more than 240 domestic airports with Delta logos, replacing Northwest.