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What: Mahan Air Airbus A300-B4 en route from Zahedan to Tehran Mehrabad (Iran),
Where: Zahedan
When: Mar 9th 2012
Why: THe flight was en route but the cabin did not pressurize.
THe crew returned to Zahedan where they made a safe landing. There is question whether the ac system was at fault or off.
Several hours later, the plane took off successfully and made the flight.