I have often heard stories about how most of the MD-80 fleet that are being retired in the US were modified and upgraded.

What were the modifications or upgrades done?

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    $\begingroup$ Can you link some of this stories? $\endgroup$ – Manu H Mar 11 '20 at 10:52
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    $\begingroup$ It won't be much mechanical. It's going to be almost all avionics/electronics upgrades, like changing from steam gauges to flat panels, or sometimes structural mods and reinforcements to allow operation to higher hours without unworkable inspection frequency requirements. $\endgroup$ – John K Mar 11 '20 at 19:27

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