The world’s busiest airports, in pictures

Travelers' families and friends wait at arriving area of Maynard H. Jackson Jr. International Terminal on Tuesday, March 22, 2016. Bombs exploded at the Brussels airport and one of the city's metro stations Tuesday, killing at least 31 people and wounding dozens, as a European capital was again locked down amid heightened security threats. HYOSUB SHIN / HSHIN@AJC.COM