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Since 2017, drones and cyber-outages have exposed aviation weaknesses.

Police announced early Thursday that Denmark's Aalborg Airport, which is used for both commercial and military flights in Denmark, had been closed because drones were present in the airspace. This comes two days after Copenhagen Airport was shut down due to drone sightings, raising European security concerns.

Since 2017, airports have been repeatedly affected by a series of drone sightings, digital outages and other disruptions. These incidents bypass core flight safety systems and instead impact choke points like check-in/boarding systems, power infrastructure, and airfield perimeters. This causes ripple effects throughout networks.

IT FAILURE at BRITISH AIRWAYS LONDON Hubs on May 27, 2017.

British Airways cancelled flights to and from Heathrow Airport, Europe's busiest, as well as Gatwick, on the first holiday weekend day due to a power problem in a data centre that affected 75,000 passengers.

On the morning of May 27, a power surge hit BA's flight and baggage systems, as well as its communication systems. The surge was so powerful that it rendered the backup systems ineffective. Delays continued into the next Monday while systems were restored.

December 19, 2018: DRONE SIGHTINGS REPEATEDLY AT LONDON GATWICK

Gatwick Airport in London was shut down for three days by persistent drone reports during the peak travel period leading up to Christmas. Around 140,000 passengers were affected, and around 1,000 flights. This was the largest disruption since Icelandic volcanic ash clouds in 2010.

Gatwick was invaded by the British army to deploy "specialist" equipment, as commercial anti-drone capabilities were not yet available.

It was the longest disruption ever experienced at an airport of Gatwick's size. Dubai airport was closed several times in 2016 because of unauthorised drone activity. However, the longest closure was less than two hours.

The U.S. is experiencing a nationwide stoppage on January 11, 2023 due to a failure of the safety system.

After a system failure, the Federal Aviation Administration (FAA), ordered a nationwide stop for about 90 minutes. This caused more than 11,000 U.S. flight disruptions.

The FAA's system alerts pilots of a variety of hazards near airports, such as snow, volcanic ash, or birds. The system also informs pilots about closed runways, temporary air restrictions and volcanic ash.

August 28, 2023: NATS FLIGHT DATE GLITCH in UK

UK air traffic control restricted flows following a processing error in flight plans, forcing manual entry. A total of 1,500 flights were canceled and the disruptions continued into the next day.

The global Windows outage will occur on July 19, 2024 due to a faulty crowdstrike update.

CrowdStrike, a global cybersecurity company, released faulty software that caused widespread Windows crashes. This affected many industries and grounded over 5,000 flights around the world.

Delta Air Lines and Ryanair have reported delays and disruptions in the United States, Asia, and Europe. United Airlines, Air India, and United Airlines also confirmed that they were affected.

U.S. cancellations exceeded 2,200 on the first day, with almost 7,000 delays. Some airlines took several days to recover their operations.

March 21, 2025 - SUBSTATION FIRE CLOSES LONDON HEATHROW

Heathrow Airport in Britain, the fifth busiest airport in the world, was closed for 18 hours following a massive fire that knocked out power at an electrical substation nearby. This left over 200,000 passengers stranded and cost airlines millions of dollars.

Airport was due to handle up to 1,351 flights, carrying up to 291,000 passengers on Friday. However, planes were diverted from the airport to other airports across Europe and Britain.

September 10, 2025 - DRONE INTRUSION INTO POLAND CLOSES SEVERAL AIRPORTS

Around 21 suspected Russian drones were detected in Polish airspace, causing the temporary closure of several airports.

Airports in Warsaw Chopin, Modlin, Rzeszow, and Lublin, located in the east of Poland, were temporarily closed, before they reopened.

Cyber attack on multiple European Hubs September 20, 2025

Cyberattacks on Collins Aerospace (owned by RTX), a provider of check-in and boarding system, have disrupted airport operations in several European cities, including Heathrow Airport, Berlin Airport, and Brussels Airport.

Due to persistent problems, Brussels Airport cancelled 25 flights on Saturday and Sunday as well as 50 flights on Monday.

September 22, 2025: DRONE INCURSIONS IN DENMARK AND NORWAY

Copenhagen was repeatedly overflew by two to three large drones, causing a four-hour shutdown of the airport, delays and diversions, and leaving tens thousands of passengers stranded.

The Norwegian authorities also closed the airspace of Oslo Airport for three hours following a sighting of a drone.

Denmark has said that the incident at Copenhagen Airport was the most severe attack on its critical infrastructure. It also linked the incident to a number of suspected Russian drone intrusions and other disruptions in Europe.

September 24, 2025 - DENMARK CLOSES ANOTHER AIRPORT DURING DRONES

Police said that drones were first seen near Denmark's Aalborg Airport at 9:44 pm (1944 GMT), on Wednesday.

Police said that the drones had followed a pattern similar to those which had stopped flights at Copenhagen Airport two days before.

Police added that the closure of Aalborg Airport also affected Denmark's Armed Forces because it was used as a base for military purposes. (Reporting and editing by Matt Scuffham; Jamie Freed, Michael Perry and Matt Scuffham)

(source: Reuters)