Several British airports have warned this Tuesday that there will be “significant delays” on flights despite having fixed the technical failure that affected the UK air traffic system on Monday.

Thousands of passengers were unable to travel to and from the UK yesterday due to a technical problem that disrupted the flight planning systems in this country, but it could be resolved later, according to NATS, the air traffic provider.

London Heathrow airport has indicated that people who have flights today contact their airlines to find out the status of their trips before going to the terminal, while London’s Gatwick airport has also clarified that it expects to operate a normal service , although it has also asked passengers to contact your airlines. London Luton Airport has warned that flights in the UK are still subject to delays or cancellations. UK Transport Minister Mark Harper today apologized to travelers for the disruption to their journeys.

“The system was fixed yesterday afternoon and things are getting back to normal, but obviously there are some outages that will continue today and I know thousands of people have been affected,” Harper told local media.

“I hope that the airlines assume their responsibilities to ensure that people return home, provide them with an alternative flight and take care of food, drink and accommodation,” the minister said. In addition, the minister has ruled out that yesterday’s problem was related to a cybersecurity incident, but that a report will be made on what happened.

NATS explained yesterday that the problem in flight planning “It affected the system’s ability to automatically process flight plans, which meant that they had to be processed manually.” The incident caused chaos at airports, a festive day in the United Kingdom and the return of many travelers from their summer holidays.