See link below re this aircraft, and how one lucky woman changed her flight to an earlier one -
https://www.bbc.co.uk/news/world-asia-china-60819760
Also from the above linK
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"The aircraft was a 737-800, a well-proven design first produced in the late 1990s. It is a workhorse of the aviation world, with thousands still in service.
It has a strong safety record. Fatigue cracks have been found in some older planes, but this one was not quite seven years old."