The 2015 and 2016 J.D. Power and Associates rankings for US "Large Passenger Airports" lists PDX at the #1 spot and overall highest amongst passenger satisfaction criteria [REF].
In 2008, a J. D. Power and Associates study contradicted the magazine's assessment, ranking the airport 19th in overall airport satisfaction out of 21 US airports with from 10 to 30 million passengers per year.