An independent inquiry is to be set up to investigate the air traffic control computer failure which disrupted flights at UK airports last week.
National Air Traffic Services (Nats) has blamed a software glitch at its centre at Swanwick in Hampshire.
The inquiry will look at Nats' handling of the episode and whether lessons were learned from previous failures.
Later, Transport Secretary Patrick McLoughlin will be questioned by MPs about the incident.
The UK's Civil Aviation Authority (CAA) says it will appoint an independent chair to lead the inquiry, which will take evidence from experts on information technology and air traffic control.
The computer failure caused huge problems at airports around the country on Friday - including delays at Heathrow and Gatwick, where departing flights were grounded for a time. Other UK airports reported knock-on effects.
Heathrow Airport also cancelled about 40 flights on Saturday morning before normal services were resumed.
It comes a year after a telephone failure at the Hampshire control room which also caused flights to be disrupted - one of a number of technical hitches to hit the partly-privatised Nats since the Swanwick centre opened in 2002.
The transport secretary said the system failure was "unacceptable" and has asked for a full explanation from Nats about what went wrong.
The BBC's political correspondent Robin Brant says Mr McLoughlin can expect to have a preliminary report from Nats on his desk by Monday morning.
He will face questions from MPs on the transport select committee on Monday afternoon.
'Dreadful' disruptionAt the weekend, the chief executive of Nats, Richard Deakin, said a single line of code in one computer system at the UK's national air traffic control centre had caused the problems.
But he warned updating some of its "elderly" systems posed a "challenge".
Mr Deakin told the BBC that the software problem was "buried" among millions of lines of computer code.
He said Nats was spending an extra £575 million over the next five years to bring its systems "up to date", but warned making improvements was a challenge as they had to be made "while the engine was still running".
Labour MP Paul Flynn has called for Mr Deakin to be docked bonuses in his salary because of the "dreadful" disruption.
The chairwoman of the transport select committee, Louise Ellman, said it was "vital that we establish what happened".
She said her committee would also call Nats and the Civil Aviation Authority to give evidence.
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