Some flights had to depart from Gatwick Airport without passengers' luggage due to a problem with the baggage system.
Holidaymakers reported long queues at check-in desks at the airport on Friday morning.
Airport officials first posted a message on Twitter shortly after 5.30am to alert travellers to the issue.
One passenger, Simon Armiger, tweeted:
Another traveller, Mark Ralphs, from Brighton, wrote:
Gatwick Airport said: