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What: Continental Airlines Boeing 737 en route from San Antonio to Houston
Where: San Antonio
When: Apr 28, 2011
Who: 151 aboard
Why: The plane had taken off and developed a “strong chemical odor.” The pilots returned to San Antonio International Airport and made a safe landing; however they did not know the cause of the odor and for caution’s sake, took the plane to the “ramp” area. Several passengers developed respiratory distress.
The crew boarding wore hazmat suits. The source of the chemical odor was not identified.

Air India flight AI-120 had to divert and make an emergency landing in Tehran, Iran, on August 9th.
Malaysia Airlines flight MH-180 made an emergency landing in Chennai, India, on June 10th.

