Thomas Cook Airlines’ Scandinavian division has resumed flights, restoring services a day after the collapse of the main UK tour operator.

The Scandinavian arm, based in Copenhagen, had initially been forced to ground its fleet – about a dozen Airbus A330s and A321s – after Thomas Cook Group filed for insolvency.

But it says it received clearance 24h later and flights were restored on 24 September.

The carrier operates on behalf of the Danish tour operator Spies, which states that it is “not part” of the Thomas Cook Group insolvency and is continuing as an independent company.

Spies has been associated with Thomas Cook Group since 2007, and says the failure led to “serious consequences” including the necessity to conduct a “complete overview” of the company’s operations – which forced the Scandinavian arm to “keep aircraft on the ground”.

“We are aware that [this suspension] created unrest and uncertainty,” says Spies chief executive Jan Vendelbo.

But he says that Spies and its sister companies, along with Thomas Cook Airlines Scandinavia, are healthy Nordic travel firms.

“We are an independent and profitable entity, which is why we have already been able to secure our continued operations, with the support of our banks and creditors,” he adds.

Thomas Cook Airlines Scandinavia is operating several services on 25 September to destinations including resorts in the Mediterranean and the Canary Islands.