DOHA, QATARQatar Airways is demanding more than $600m compensation from Airbus for its grounded A350 jets due to the painting issues on the surfaces of the planes.

The Qatari flag carrier and European planemaker have been locked in a dispute for months over A350 quality issues, including blistered paint, among others.

Last month, the airline filed a complaint against the manufacturer in a UK court over skin flaws on A350 passenger jets, bringing the two sides closer to a rare legal confrontation over aviation safety.

The Gulf carrier is also asking British judges to order Airbus not to deliver the A50 jets until the issue is fixed.

Qatar's Civil Aviation Authority ordered the airline to stop flying 21 out of its 53 A350 jets as the problems appeared. Airbus describes the problem as a technical issue rather than a flight safety issue.

Airbus proposes interim solutions ranging from repairs to repainting and accuses Qatar Airways of ignoring those proposals without reasonable cause.

Qatar Airways says that it is not sure whether the proposed solutions would work without deeper checks. Chief executive Akbar Al Baker asks why Airbus is still working on a solution if a reliable fix is already available.

The 21 grounded jets represent 40% of the carrier's A350 fleet. Qatar Airways was the launch customer of the type with the largest order among all.

Other airlines around the world still operate the jet, saying that cosmetic issues don't affect the aircraft's airworthiness.