Global Gateway

Metros whose airport dimension clears 5.0, the floor that separates a continental gateway from a regional hub. The composite blends passenger traffic, intercontinental connectivity, and hub capacity. Sixty-two metros qualify, ranging from London and New York at the apex through the regional gateways that anchor a continent's air network. Below the threshold, airports are large enough to be regionally important but not the kind of node that defines the global air network.