Heathrow Airport has advised that customers should contact their airline to query if they are experiencing any delays.

Flights have resumed, however.

As of 7.15am, 25 flights at Heathrow were cancelled - 19 arrivals and six departures. At Gatwick, four flights appeared to be cancelled.

At Heathrow, British Airways appears to be the most affected airline flying in and out of the capital.

A number of Heathrow and Gatwick flights are cancelled this morning as we move into the third day of flight disruption.

Technical issues with air traffic control systems on Thursday have led to more than 2,000 flights being cancelled, while the repercussions continue to take their toll on flight schedules.

We’ll bring you the latest updates as Heathrow and Gatwick airports scramble to get back on track.

Our coverage on the major disruption at UK airports has been suspended for the day.

Check back tomorrow for the latest updates.

A total of 357 outbound flights have been cancelled or did not fly today, aviation analytics firm Cirium has said.

However, it did say cancellations appear to be slowing now.

More than 2,000 flights have been impacted altogether.

Here’s a breakdown by airport:

One passenger wrote on social media: “Can't believe Ryanair won't offer compensation on our flight from Nice to Stansted which was delayed by 4 HOURS

“It was caused by air-traffic control issues, but a delay of 4 hours significantly impacts other travel plans/bookings at the arrival end.

“Surely that's not right?’

Hundreds of thousands of passengers hit by the flights chaos in Britain are unlikely to be able to get compensation, the CAA has said.

They might have expected to get payouts of £520 for delays to their journeys.

But airlines are unlikely to have to pay out as the incident is expected to be put down to the result of ‘extraordinary circumstances’ under passenger rights rules.

A UK Civil Aviation Authority spokesperson said: “We know many passengers have faced significant disruption and frustration following the NATS system issue on Tuesday, 8 September, and we understand the impact this has had on their travel plans.

“As part of our established regulatory framework, NATS will be providing a technical report on the incident shortly. In addition, the Government has asked the UK Civil Aviation Authority to carry out an independent review of the disruption to establish what happened and consider how well NATS is set up to deliver a resilient service in the future.

“In the meantime, we have reminded airlines of their responsibilities to look after passengers whose flights have been delayed or cancelled. We consider that disruption caused by the NATS outage is likely to be considered the result of ‘extraordinary circumstances’ under passenger rights rules. This means that although passengers should be looked after by airlines, they are unlikely to be entitled to compensation for delays or cancellations that were directly caused by the incident.”

An American family caught up in the travel disruption today said they joined a queue to speak to a member of staff about the status of their flight, only to be told the customer service staff there couldn’t help.

"There were really long lines for an information booth that we stood in for a couple of hours and when we got up in the front they finally said they can't help you when you get there,” father Bob Sehl said.

The family’s Santorini to Heathrow flight was originally diverted to Stansted, which doesn't operate BA.

This meant that at 2.30am, more than 10 hours after landing, they had to travel to Heathrow to try and continue their homeward journey to Connecticut.

The family say they now face a night sleeping on Heathrow’s floor as all the local hotels have been booked up.

An American woman has said it is “nerve-racking” to wait in departures without a gate number after her planned route to Warsaw was cancelled.

Jennifer Jones, 69, is on a layover at Heathrow from Phoenix, Arizona, and said: “(We) had to wait on the plane for the bus to come get us because everybody was trying to get on the buses, so we finally got on the bus and got inside, and it was chaos because everybody’s flights were cancelled, and by the time we figured out ‘well, I’m going to have to stay the night’, the hotels were all booked.”

She landed at about 3pm, found a hostel that she arrived at at about 9pm, and then returned to Heathrow at 2.30am “hoping to get another flight so I don’t miss any flights to Warsaw”.

Perched on a luggage trolley, Ms Jones, who has had her trip to Warsaw with her friends booked for about a year, added: “In the States you go to the airport and you just take your boarding pass and go through security and go to your gate and then you sit there and guard your plane, you know, and here you don’t even have a gate assignment so you can’t get through security yet – that’s a little nerve-racking.”

Airlines UK has written to the Secretary of State for Transport, Rt Hon Heidi Alexander MP, to register serious concerns over yesterday’s technical failure at NATS.

It marks the third major system failure in three years which has caused major disruption across the UK’s aviation network.

Tim Alderslade, CEO of Airlines UK, said: “The latest NATS failure has again exposed a gap in the UK’s aviation regulatory framework. Airlines are expected, in supporting passengers, to absorb the costs of disruption, even when the cause lies entirely outside their control.

“The result is a system where airlines pick up the bill for the mistakes of others, while the organisations responsible face little or no financial consequence. Accountability should sit where responsibility lies and the Civil Aviation Bill offers the opportunity to address this.”