Travellers are facing disruption at airports across the world today after reports of check-in computer systems crashing.
Problems have been reported by passengers at London's Gatwick and airports in Australia, Paris, Washington, Singapore, South Korea and South Africa, among many other locations.
Travellers said they were unable to check in for their flights with a number of airlines including British Airways, Air France, Qantas and Lufthansa.
Some said they had been waiting to check in for nearly two hours without any luck.
— Cornelia Altrichter (@c_altrichter) 28 September 2017
Tyrone Kennedy wrote on Twitter: "Systems down in Gatwick just hope it's not another #wannacry can't check in at the mo."
Another passenger wrote of Singapore's Changi airport: "Alert: Whole changi airport check in system down."
#ADVISORY: Due to a technical issue affecting check-in systems of some airlines, the check-in process may take longer than usual...— Changi Airport (@ChangiAirport) 28 September 2017
#ADVISORY: ... Manual boarding passes have to be issued. We appreciate your patience in this matter. Thank you.— Changi Airport (@ChangiAirport) 28 September 2017
The cause of the widespread problems was not clear.
A spokesman for Gatwick said at 11am: "It was a momentary outage, affecting a few airlines, and everything is up and running as normal now."
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