Congonhas, Brazil

The population of just 52,890 belies Congonhas' outsized importance as a transportation hub for São Paulo. Despite its small size, the airport is the second busiest in Brazil, handling a staggering volume of regional flights. However, this convenience comes at a cost - the airport's runways are notoriously slippery, leading to multiple deadly accidents over the years. Bureaucratic headaches are also a persistent annoyance, with strict slot restrictions and weight limits for aircraft. Overall, Congonhas is best suited for business travelers seeking quick hops around Brazil's central-southern region, who can tolerate the occasional weather-related delays and regulatory hurdles.