Massive 94% Full: Delta’s 10 Busiest Long-Haul Routes Revealed [Full List]

Between February 2025 and January 2026, Delta Air Lines carried 17 million passengers on its long-haul routes. According to the US Department of Transportation (DOT), the SkyTeam member’s traffic rose by 4% compared to the prior 12 months. It carried one in eight of the country’s long-haul passengers.