Air force plane crash

The plane that pilot Taniul was flying was a PT 6, can anyone answer how old these planes are? I am more than certain they were bought long before I was born, that is more than two decades back. Then comes the question of whether a poor country like Bangladesh can afford new planes or not, well of course it can, recently I learnt that the air force bought some VIP helicopters. I would surely like to know how the VIP helicopters are different from the regular ones, do they have thrones installed in them without which the VIPs cannot travel? What is more important, the luxury of the VIPs or the safety of pilots ?

It is even more disappointing that the incident of pilot Taniul's crash happened on the same day that the country got to read in the papers about how the air force has claimed the discrepancies of the prices paid for the newly purchased aircrafts to be mere errors. Errors?!! In the largest purchase of the air force in recent times? How credible is it? There can be one and only one price for something we buy, and not many different ones that can be used at convenience of the authorities.