Air Iceland Connect's TF-FXI is a Bombardier Dash 8 Q400. It was delivered early 2001 to SAS. Then it moved to Flybe, Colgan Air, was stored by Bombardier and Air Niugini and finally came to Air Iceland Connect in February 2016.
Picture from the Reykjavik City airport 11.1.2018 by Ilkka Siissalo.

Another picture of the same Air Iceland Connect's TF-FXI as it was again at the Reykjavik City airport and leaving.
Picture from the Reykjavik City airport 11.1.2018 by Ilkka Siissalo.

Two Air Iceland Bombardier Dash 8 Q400 machines at the Reykjavik City airport.
Picture from the Reykjavik City airport 20.5.2018 by Ilkka Siissalo.

A closer view of the same Air Iceland Bombardier Dash 8 Q400 machines at the Reykjavik City airport.
Picture 20.5.2018 by Ilkka Siissalo.

This is the smallest version of the Bombardier Dash 8, the Dash 8 version 100. It can operate from extremely short airfields. This machine is the TF-FXG. It was delivered to Mesa Airlines already in 1996, registered in the US and it has since also flown for Field Aviation of Canada before joining the Air Iceland Connect fleet in 2012.
Picture from Reykjavik City airport 12.1.2018 by Ilkka Siissalo.