Virgin check-in drama ends after delays

A technical issue that took down the entire computer check-in system for Virgin Australia has been resolved after thousands of passengers were stranded at airports.

The disruption was due to an Optus technical issue which delayed flights from about 2pm on Sunday, with passengers having to be manually checked in, the airline said.

After three hours, Virgin Australia confirmed the issue had been resolved, but warned passengers could still face some delays during the afternoon.

"Our check-in systems are now fully operational after an Optus technical issue was resolved," the airline said in a statement.

"We sincerely apologise for any delays and inconvenience this issue has caused our guests."

The Adelaide Crows, who were due to fly home from Melbourne after Saturday's defeat in the AFL grand final, were among those affected.