Passage: The aircraft was a Bombardier Dash 8 Q400, configured with a seating capacity of 76 passengers, and registered as aircraft S2-AGU. It was first delivered to Scandinavian Airlines in 2001, and flown by three airlines before being purchased by US-Bangla Airlines in 2014.  It had already been involved in a minor incident in 2015, when it skidded off the runway in Saidpur resulting in minor damage to its right hand main wheels.   At the time of the crash, the aircraft had flown a total of 28,649 takeoff cycles for a total of 21,419 hours and was current on its maintenance.  The impact forces of the crash and the post-crash fire completely destroyed the aircraft.

Question: What year did US-Bangla Airlines buy the Bombardier Dash Q400?
2014