Between August and the end of October, British Airways will be cutting 10,300 flights.
Between April and October, nearly 30,000 flights will be removed from the schedule of British Airways.
The airports are affected by the cancellation.
Demand for air travel has rebounded after Covid restrictions.
The aviation industry continues to face significant challenges and we are focused on building resilience into our operation to give customers the certainty they deserve.
The editor of Which? Travel said the latest cancellation was a "damning indictment" of the summer flight schedule.
Thousands of customers have had their flights canceled in recent weeks, but BA has continued to promote and sell flights it could not fulfill.
The Department for Transport (DfT) announced last month that they would give airlines a short window to hand back unused slots at airports, but they are not sure if they will be able to do so.
The goal is to make schedules more resilient so that they don't get disrupted over the summer.
Airport slots allow airlines to take off or land at certain times. If flights are canceled, the carriers could lose the slots and take a hit to their business.
The airline blamed other airlines for the situation they found themselves in.
The statement said that they did not support this latest slot waiver regulation from the UK government, which has been handed out for the benefit of airlines who failed to adequately prepare for the return of air travel after Covid.
"These slot waivers will lead to fewer flights and reduced connections, which will hurt competition and lead to higher fares for hard-pressed UK consumers," it said.
There were no disruptions due to staffing shortages this summer according to the company.
The new flexibility offered by the amnesty could allow BA to reduce their schedule and consolidate some of their quieter services so that they can protect as many of their holiday flights as possible, according to the airline.
Most of our flights are unaffected and the majority of customers will get away as planned, but we don't underestimate the impact this will have and we're doing everything we can to get their travel plans back on track," the airline said.
The reason for the advance notice is to reduce last-minute disruptions over the next few months.
Hundreds of thousands of people's plans will be disrupted.
British Airways hopes that the last wave of summer cancellation will be the last one.
The majority of services will continue as planned.
The return of international travel has not been smooth with staff shortages still causing problems.
The latest sign that some airlines have had to scale back their ambitions is today's announcement.
The announcement did not affect long haul flights.
The airline said it would be contacting customers with the offer of a full refunds or rebookings.
There was an increase in calls to the company after the news of cancellation was made public.
Current disruption is causing high call volumes. If your flight has been canceled, we'll call you.
There are other airlines that have to cancel flights over the busy summer period.
EasyJet was forced to cancel some 10,000 flights between July and September due to a lack of staff.
Thousands of jobs were cut as the industry ground to a halt because of the Pandemic.
Now that travel has resumed, airlines are trying to put on the same number of flights as they did before Covid, but it's hard to find workers.
The airlines were expected to cancel a lot of flights this week.
The travel chaos in May was caused by a shortage of airline and airport staff.
The move would give certainty to customers.
Is that which? The Civil Aviation Authority was reported to by Travel for failing to tell passengers about their right to compensation.
If BA fails to meet its legal obligations, theCAA must take action.
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