The travel plans of hundreds of thousands of people were thrown into chaos on one of the busiest days of the year for airports, as the UK's air traffic control systems suffered a "technical fault".
UK airports are still struggling to recover from the hours-long failure of processing flight plans – with warnings delays could last for days.
Downing Street has ruled out a cyberattack, but there is speculation that an incorrect flight plan filed by a French airline could be to blame.
On the Sky News Daily, Niall Paterson looks at what went wrong and if a similar problem could happen again. His guests are former air traffic controller Michele Robson, who was stuck at Jersey airport yesterday, and travel editor for The Independent, Simon Calder.
Senior podcast producer: Annie Joyce
Podcast producer: Emma-Rae Woodhouse
Interviews producer: Alex Edden
Podcast promotions producer: David Chipakupaku
Editor: Paul Stanworth
