SAS CRJ9 at Dusseldorf on Jun 18th 2014, these dreaded gear pins

A SAS Scandinavian Airlines Canadair CRJ-900, registration OY-KFC performing flight SK-620 from Dusseldorf (Germany) to Copenhagen (Denmark), had overnighted in Dusseldorf and was departing for its first flight SK-620 of the day, when the nose gear did not retract. The crew stopped the climb and returned to Dusseldorf for a safe landing about 15 minutes after departure.

A passenger reported that the captain announced that most likely a gear pin had not been removed and a normal landing would occur. The passengers were kept on board after landing. The aircraft was able to depart again about 55 minutes on the ground.

The aircraft departed again and reached Copenhagen with a delay of 70 minutes.