What: Southwest Airlines 737 Flight 3252 en route from from San Diego to Baltimore
Where: Lindbergh Field
When: Dec 1, 2012, 7:15 a.m.
Who: 129 passengers, 5 crew
Why: As the plane was taking off, a flight attendant smelled smoke. The pilot returned to San Diego and made an emergency landing on Lindbergh Field. Oxygen masks were deployed but there were no injuries.
The plane was slated for inspection and will be removed from service until the issue is solved.

Air Arabia flight G9-522 had to divert and make an emergency landing in Kolkata, India, on April 6th.