Inside the Milestone school plane crash: What kind of aircraft was it?

As we uncover the details of the Milestone school plane crash, it begs the question. What kind of aircraft was it?
Here's what we know so far.
First off, Bangladesh's F-7 is a modern variant of China's Chengdu F-7, itself modelled on the Soviet MiG-21.
While considered outdated by global standards, it remains in service due to its cost-effectiveness and suitability for pilot training and limited combat roles.
Its production ceased after China delivered the last of 16 units of F-7 BGIs to Bangladesh in 2013.