British Airways has reportedly suspended selling short-haul flights from Heathrow for at least a week.
Tens of thousands of flights have already been cancelled this summer as the industry struggles to cope with the demand for air travel amid staffing shortages.
The company earlier responded to Heathrow’s cap on passenger numbers by announcing it would cancel 10,300 flights until October, with one million passengers affected.
Many passengers flying to and from the UK’s busiest airport have suffered severe disruption in recent months, with long security queues and baggage system breakdowns.
The move to suspend ticket sales for BA short-haul flights from Heathrow will push up prices on rival firms, according to the Times.
The airline accused the airport of showing “blatant disregard for consumers” by attempting to force it to “deny seats to tens of thousands of travellers” through the cap.
A Heathrow spokeswoman said at the time it would be “disappointing” if “any airline would want to put profit ahead of a safe and reliable passenger journey”.
Virgin Atlantic also criticised the airport’s actions and claimed it was responsible for failures which are contributing to the chaos.
Airlines on July 21 were accused of “harmful practices” in their treatment of passengers affected by disruption.
The Competition and Markets Authority and the Civil Aviation Authority issued a joint letter to carriers, expressing concern that “consumers could experience significant harm unless airlines meet their obligations”.
The letter stated: “We are concerned that some airlines may not be doing everything they could to avoid engaging in one or more harmful practices.”
These include selling more tickets for flights “than they can reasonably expect to supply”, not always “fully satisfying obligations” to offer flights on alternative airlines to passengers affected by cancellations, and failing to give consumers “sufficiently clear and upfront information about their rights”.