2. Jacksonville International Airport
Photo: Travelers waiting in the long security lines at Jacksonville International airport. (Photo courtesy of TennesseePhotographer/iStock Editorial/Getty Images Plus)
Six out of 10 tweets regarding Florida's Jacksonville International Airport are angry, elevating JAX to number two on the list. "Line, TSA, garage, delays and employees" are some of the repeating words used to grumble over the civil-military public airport, which hosts more than 6.5 million passengers annually.