The transport secretary has apologised for yesterday's nationwide air site visitors management fault - saying points on this scale "haven't happened for a decade".
Mark Harper confused that technical consultants have dominated out a cybersecurity incident, with the Civil Aviation Authority set to analyze.
"Something on this scale hasn't happened for almost a decade - normally the system works very well," Mr Harper advised Sky News.
Britons sleeping on flooring in airports - stay updates
Thousands of passengers have been affected by yesterday's disruption - with aviation analysts warning there may very well be knock-on results for days to come back.
And there have been studies of heated scenes at airports throughout Europe, with "fists flying" in Palma as exasperated vacationers wrestle to return dwelling.
Heathrow Airport says companies will stay "significantly disrupted" at the moment - and passengers are being urged to contact their airline earlier than heading to the terminal.
A spokesperson for the airport mentioned:
"Schedules proceed to be affected by yesterday's restrictions on UK airspace.
"While the majority of passengers will still be able to travel, there will unfortunately be some disruption on some routes, including flight cancellations.
"It is essential for all passengers to test the standing of their flight with their airline earlier than travelling to Heathrow.
More than 60 flights have been cancelled on the west London airport - made up of not less than 32 departures and 31 arrivals.
British Airways seems to be the worst affected airline.
Elsewhere, London Gatwick mentioned it plans to function a traditional schedule on Tuesday following the disruption.
However, passengers have been suggested to test the standing of their flight with their airline earlier than travelling to the airport.
London Stansted additionally mentioned it deliberate to run a traditional flight schedule on Tuesday, however added "our terminal may be busier than anticipated".
And main UK airways corresponding to Tui and BA warned of "significant delays" for passengers amid adjustments to schedules, with airports urging travellers to test with their flight operators earlier than they head to the terminal, in case of delays and adjustments.
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