The damaged engine can be seen in video a passenger tweeted from United Airlines Flight 1175.
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The flight took off from San Francisco International Airport just after 9 a.m. and landed at Honolulu's Daniel K. Inouye International Airport at 2:42 p.m.
The aircraft involved is a Boeing 777. It has two engines and is designed to fly on just one engine for more than three hours over water.
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