Dusseldorf Airport - American Airlines
Surprisingly, the only US airliners seen during my weekend visit to Dusseldorf belonged to Delta Airlines.
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Atlanta, Georgia-based Delta Airlines is the world's second-largest operator in terms of scheduled passengers carried, revenue passenger-kilometres flown and fleet size. As of 31 March 2019, Delta, along with its subsidiaries and regional affiliates, operates over 5,400 flights daily, serving an extensive domestic and international network that includes 325 destinations in 52 countries on six continents.