Busiest widebody airports in June led by Tokyo Haneda

Dubai Airport follows closely behind Tokyo Haneda but faces limitations due to slot availability. Despite this, Dubai is expected to surpass Haneda once airlines transition operations to Al Maktoum Airport.

London Heathrow holds third place with significant long-haul traffic comprising most of its widebody operations. British Airways is a major operator at Heathrow, though other carriers such as Virgin Atlantic and American Airlines also contribute substantially to the airport’s flight numbers.

Doha Airport presents a contrasting picture where Qatar Airways dominates the scene with over 90% of widebody flights. The airline's partnerships further bolster its presence at Doha, particularly with new routes like Virgin Australia's services connecting Doha to Australia starting in June.

Other notable airports include Singapore Changi and Seoul Incheon which maintain robust schedules thanks largely to their primary operators—Singapore Airlines and Korean Air respectively—while Istanbul Airport benefits from Turkish Airlines' strong presence despite a lower percentage of twin-aisle flights compared to others on the list.

In conclusion, while these airports continue to handle substantial widebody traffic in June, their rankings reflect strategic adjustments by airlines responding to passenger demand dynamics and operational constraints like slot availability.