Delta Air Lines operates its longest Airbus 330-300 (A330-300) route between Amsterdam, Netherlands (AMS), and Portland, OR (PDX), covering a distance of 5,004 miles. Following closely, the second-longest route, at 4,941 miles, is between Athens, Greece (ATH), and New York, NY (JFK). The third-longest route is between ATH and Boston, MA (BOS), at 4,755 miles, based on information from Delta Air Lines.