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Contact photographer Boris Sadovsky
What: Sky Express Boeing 737-500 en route from Moscow to Chelyabinsk
Where: Moscow
When: Jan 5th 2012
Who: n/a
Why: After takeoff, the flight developed cabin pressurization issues.
A half hour after takeoff, the flight returned to Vnukovo Airport in Moscow, and made a safe landing.

United Airlines flight UA-839 made an emergency landing in Sydney, Australia, on October 4th.
An Air Canada flight had to divert and make an emergency landing in Calgary, Canada, on April 4th.