Could it be related to this?
Global Altea outage.
Qantas has confirmed a global outage of Amadeus' Altea reservation system is the cause of chaos at check-in counters nationally for the airline on Sunday.
"Global issues with Altea system affecting check-in," Qantas said on its official Twitter page.
"Issue resolved and ports will be back online shortly. We're sorry for the inconvenience."
Apparently it is due to the extra second being added to to the world’s electronic clocks at midnight on Saturday.......