Delta Airlines luggage carts at MSP Airport in Minneapolis-St. Paul.

A UPS WorldWide Services plane in Tampa, Florida.

Viewed through the grid of Concourse A’s vast curtain-wall windows, a Delta Air Lines jet sits at the gate at Detroit Metro Airport, undergoing final preparations before departure. Ground crews maneuver baggage carts and service vehicles along the concrete apron beneath the overcast Michigan sky. The McNamara Terminal’s panoramic windows reveal the precision and coordination of modern aviation — a quiet balance of machinery, logistics, and architecture that defines one of America’s most important airline hubs.