Airlines person reacted furiously aft a method glitch successful aerial postulation power systems led to much than 150 formation cancellations.
The National Air Traffic Service (NATS) has apologised for the IT problems - and said systems were backmost up and moving 20 minutes aft the "radar-related issue" was detected astatine 4.05pm.
But with thousands of passengers suffering extended question disruption, during 1 of the busiest times of the year, hose executives person warned this isn't bully enough.
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Ryanair's main operating serviceman Neal McMahon has called for NATS main enforcement Martin Rolfe to resign - and claimed Wednesday's incidental was "utterly unacceptable".
He said: "It is outrageous that passengers are erstwhile again being deed with delays and disruption owed to Martin Rolfe's continued mismanagement of NATS.
"It is wide that nary lessons person been learnt since the August 2023 NATS strategy outage, and passengers proceed to endure arsenic a effect of Martin Rolfe's incompetence."
Mr McMahon was referring to a glitch that affected much than 700,000 passengers 2 years agone - and said that, if Mr Rolfe refuses to measurement down, the authorities should intervene.
"Heidi Alexander indispensable enactment without hold to region Martin Rolfe and present urgent betterment of NATS' shambolic ATC service, truthful that airlines and passengers are nary longer forced to endure these preventable delays caused by persistent NATS failures," helium added.
The Department for Transport says Ms Alexander does not person immoderate nonstop power implicit NATS - and nary powers implicit staffing decisions astatine the service.
Read more: Flight delayed oregon cancelled? These are your rights
EasyJet's main operating serviceman David Morgan added: "It's highly disappointing to spot an ATC nonaccomplishment erstwhile again causing disruption to our customers astatine this engaged and important clip of twelvemonth for travel.
"While our precedence contiguous is supporting our customers, we volition privation to recognize from NATS what steps they are taking to guarantee issues don't continue."
NATS is yet to remark connected the calls for Mr Rolfe's resignation - but has stressed that the glitch is not believed to beryllium "cyber related".
"This was a radar-related contented which was resolved by rapidly switching to the back-up strategy during which clip we reduced postulation to guarantee safety," a spokesperson had said.
Departures astatine airports crossed the state person present resumed - but passengers are being urged to cheque with their hose earlier heading to terminals.
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John Carr, from Stourbridge, was connected his mode from Heathrow to Norway to assistance put his brother's wedding erstwhile helium discovered his formation was cancelled aft checking in.
"I'm beauteous gutted," helium said. "We've got loads of worldly successful the suitcases to acceptable up the venue, due to the fact that we're evidently flying to Norway. We've got the wedding rehearsal to do. It's rather stressful."
Liberal Democrat person Sir Ed Davey called for an urgent probe and besides referred to the "utterly unacceptable" disruption 2 years earlier.
"With thousands of families preparing to spell connected a well-earned break, this conscionable isn't bully enough. The nationalist merit to person afloat assurance successful specified a captious portion of nationalist infrastructure."
Transport Secretary Heidi Alexander is expected to conscionable with the NATS main enforcement Martin Rolfe aboriginal contiguous pursuing the outage.

Flights departing oregon arriving astatine a UK airport, oregon craft operated by a UK hose arriving successful the EU, are subject to rules concerning delays oregon cancellations.
Airlines whitethorn person to supply compensation, though determination are exemptions for "extraordinary circumstances", according to the UK's Civil Aviation Authority.