1. The "good" corruption. Think US congress pork barrel politics. It makes doing the right and progressive thing more expensive but it does not prevent it happening. So we grow richer.
2. The "bad" corruption. The tribal politics of mid-african nations is a well studied affair (building roads to one part of a country and not to the opposing tribal areas etc). This corruption stultifies actual growth.
(there is a point honest...)
The aircraft exists as a marker in a game of internal Iranian politics, and while there are many possible explanations I fancy the "bad" corruption one - it takes a special kind of distance from reality to imagine this will fool anyone with skin in the game - and that distance from reality tends to come from arrogant under educated privilege
In short Iran looks like it may be suffering from bad corruption. Which is interesting - there has so far only been one way to grow a global superpower - democracy, science and forcing the politicians to pay lip service to both. Both China and India are vying for that new role. We may see an answer to which of the three you can do without soon.