Question: Which airport is mainly used for general aviation, Memphis International Airport or Sheridan County Airport?
Sentence (from "Air transportation in the United States"): In 2013 there were 86 airports in the U.S. that annually handled over 1,000,000 passengers and twelve of the world's thirty busiest airports by passenger volume in 2014 were in the U.S. (down from 17 in 2004), including the world's busiest, Hartsfield-Jackson Atlanta International Airport.
Relevant evidence: No