Even though Ryanair has already pulled out of Denmark after a messy, and public falling out with Danish unions and politicians, this feud rolls on.

The city of Copenhagen has dumped its Ryanair stocks, in spite of the company's strong performance which has seen its shares rise by almost 20 percent so far in 2015.

“We have a clear conscience now that we don’t have anything to do with social dumping via Ryanair,” said council member Lars Aslan Rasmussen.

'Social dumping' is where foreign service providers can undercut local service providers because their labour standards are lower.

The holding was a source of embarrassment when it became public knowledge that the city had investments in the Irish company while it challenged its labour practises.

Here's a closer look at the #Ryanair Well Paid Jobs @FrankJensenKBH #NoThanksFrank pic.twitter.com/IzjsrbpuXk

— Ryanair (@Ryanair) May 21, 2015

During the dispute Ryanair argued that it was paying fair wages - and took to social media to make this point.

Frank Jensen, the mayor of Copenhagen became involved in the row when he banned all city staff from flying with the airline even when it was the cheapest option.

The company argued that its operations in Denmark should be in line with Irish not Danish labour laws. This would have involved signing up to a Danish collective-bargaining agreement.

We've had record bookings in #Denmark! Thanks Frank! Book our 69DKK fares before he bans them! http://t.co/iSIehuKWL2 pic.twitter.com/HeKFatQ4c4

— Ryanair (@Ryanair) May 22, 2015

It was also quick to publicise the fact that its sales improved in Denmark throughout the controversy.

“We did not expect the sea of negative publicity and the fact that nobody would give us a fair hearing in Denmark,” Michael O’Leary told the Danish press.