A man in his 40s has been arrested over a cyber attack that crippled Heathrow and other European airports over the weekend.
The UK National Crime Agency (NCA) said the suspect was detained in West Sussex on Tuesday on suspicion of Computer Misuse Act offences, and released on conditional bail.
Thousands of passengers faced disruption at multiple airports including Heathrow, Brussels - where half of all flights were cancelled - Berlin, Dublin and Cork.
The target of the cyber offensive was automated check-in and boarding software, MUSE, which is supplied by American firm Collins Aerospace and used by airlines globally.
Hundreds of flights were cancelled or delayed at airports across Europe. In Brussels and Berlin cancellations and delays are ongoing.
