This Yak-40 was originally delivered to ČSA in October 1974 as OK-EEA. It went to VZLÚ (the Czechoslovak Research and Experimental Aviation Institute) in July 1980 and later became OK-020 to be rebuilt as a flying engine test-bed. The plane was briefly also registered OK-EXB for a return ferry flight to Minsk for overhaul, reverting to OK-020 upon its return. It last flew in April 1992 and was initailly used for the ground testing of instruments but moved in April 2012 to Louny and is now preserved in the grounds of SEKO Aerospace.

On display in fictitious "SEKO Airlines" colors with fake registration. Is in fact ex OK-020, OK-EEA.

This Flogger-H really is 2735 and was comissioned in April 1981 and served with the 28. stíhací bombardovací letecký pluk (28th Fighter Bomber Air Regiment). It was decommissioned in December 1992 and made its last flight from Trenčín to České Budějovice in June 1994 followed by a road-run to Prague-Kbely. It is now on display in the SEKO Aerospace grounds at Louny.