KLD have one 737-300 as well as Russian Jets. It seems not in use as the inlets are sealed with covers - the three days in kaliningrad this jet never moved. Not yet in service? tech?

Edit 2017: This was delivered to the original owner Mar 1989, registered EI-DJK in this photo, KD Avia's first 737-300 delivered Jan 2005, used until they ceased operations in Sep 2009.