Cybercrime. Photo: Investopedia

Private data on millions of customers has been stolen in a cyberattack on three British airports, the Manchester Airports Group announced Thursday, saying the attack did not impact flights or airport operations.

MAG, which operates the Manchester, London Stansted and East Midlands airports, said the data of 8.7 million customers had been compromised.

The information included email addresses, phone numbers, vehicle registrations and postcodes.

The cyberattack took place over the weekend, and MAG said it became aware of it on Tuesday.