(Undated)  --  Portland International Airport is ranked among the best airports in the U.S.  A survey by TravelPulse shows PDX to be the 13th-best airport among the 100 included in the rankings.  The survey took a number of factors into account, such as ease of access, terminal comfort, amenities, airline volume, and business- and family-friendliness.  Atlanta's Hartsfield-Jackson is ranked by TravelPulse as the best U.S. airport, and Sea-Tac International Airport is ranked 7th.