A 2012 survey of business travelers has revealed the 16 most stressful airports in America, and Chicago's O'Hare -- the third busiest airport in the world -- topped the list. Rounding out the top ten were Los Angeles International Airport, JFK International, Hartsfield-Jackson Atlanta International Airport, New York's LaGuardia, Dallas-Fort Worth International Airport, Newark Liberty International Airport, George Bush Houston Intercontinental Airport, San Francisco International Airport, and Miami International Airport. Fifty-six percent of those surveyed found the distance between gates and terminals to be one of O'Hare's biggest challenges. Factors determining an airport's stress level included confusing airport signage, poor service, and bathrooms that were either overcrowded or too small in number. Other problems included poor Wi-Fi coverage and too few electrical outlets. Dallas-Fort Worth was named the most hassle-free airport because of its clear signs, good Wi-Fi, and food options.