Airline passengers are likely to face travel disruption over the next two days, as strikes are expected across European Air Traffic Control services.
The strikes, due to take place in Italy and Portugal, will affect British Airways and easyJet flights to, from and over these countries. BA have said they are planning on using larger planes to help customers affected by cancellations.
The industrial action is being staged by two organisations in protest against the European Commission's Single European Sky initiative, which aims to consolidate air traffic services across the continent, NATS said.
The Air Traffic Controllers European Unions Coordination (ATCEUC) - an umbrella group that represents 14,000 members across 28 countries - is calling the strike for tomorrow, before members of the European Transport Workers' Federation (ETF) then walk out on Thursday.
Air traffic controllers in the UK will be working as normal tomorrow and on Thursday, despite industrial action being planned across Europe
An Air Traffic control company said it would be "to everyone's benefit" if aviation regulators held an inquiry following Saturday's major disruption to flights.
Nats has already started its own inquiry into the events when an internal telephone system problem at the company's Hampshire headquarters led to flight delays and cancellations.
Saying he deeply regretted the disruption, Nats chief executive Richad Deakin said the best way forward was an investigation by the Civil Aviation Authority (CAA) into "the level of contingency and resilience in UK airspace".
Air traffic control company Nats has "identified and corrected" the technical problem which caused delays to thousands of flights in the south of England.
In a statement, the company said:
Air traffic control company Nats has confirmed that UK airspace remains open but restrictions are in place following "technical problems" at its Hampshire control centre today.
Air traffic control company Nats has issued a full statement on "technical problems" at its Hampshire control centre, which has caused delays to thousands of flights.
Thousands of air travellers face delays after air traffic control company Nats experienced "technical problems" at its Hampshire control centre.
The problem was at Nats' centre at Swanwick, near Southampton.
The company experienced some flight-affecting computer glitches when it first moved to the site about 10 years ago.
Air traffic control company Nats said it is restricting the number of aircraft flying across the south of England and those taking off from airports due to technical problems at its Swanwick control centre in Hampshire.