Export Development of Canada closed financing on a third and final Bombardier CRJ900 NextGen for Estonian Air.
The aircraft, MSN 15276, was delivered on 15 December.
Estonian Air already operates two aircraft of the type along with four Boeing 737 Classics and two Saab 340A aircraft.
Estonia's government approved the flag carrier's future strategy last month, which will involve a €30 million ($41.5 million) injection by the state. It revealed in September plans to introduce more routes in 2012 and develop Tallinn as a regional hub between Scandinavia and the rest of Europe to improve its financial performance.
The carrier wants to replace its two 737-300s and two 737-500s with new Bombardier CRJs as part of a company restructuring programme over the next two years.
Estonian Air said it is in negotiations to add more new generation aircraft to its fleet aiming to serve the summer 2012 schedule with seven next generation regional jets.