Emirates airline rejected an order from Heathrow Airport for it to cancel flights to comply with a cap on passenger numbers.
The west London airport this week introduced a daily 100,000 passenger limit, meaning flights must be rescheduled to other airports or cancelled.
On Tuesday, it appealed to airlines to stop selling summer tickets as it imposed the cap, which will remain until September 11.
Chaotic scenes at terminals have led to long queues, with passengers lining up outside during a…