A security expert has claimed Russia 'could well be' behind a cyber attack that crippled operations at several major European airports today.

Hackers targeted check-in and boarding systems operator Collins Aerospace on Friday night, sparking major disruption, flight delays and cancellations at transport hubs across the continent.

The company is 'experiencing a technical issue which may cause delays for departing passengers' as a result of the attack, which crippled online check-in systems at Heathrow, Berlin and Brussels.

One expert told the Daily Mail that Russia could be behind the hack, adding: 'The timing of the attack, coming just hours after reported Russian incursions into NATO airspace, will only fuel suspicion.'

On Friday three fighter jets entered neighbouring Estonia in a 'reckless' and 'brazen' move that was condemned by Donald Trump.