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Re:Did Malaysian Airlines 370 disappear using SIA68/SQ68 (an... by jimktrains2 on Monday March 17, 2014 @11:24AM (#7415569)
From what I've read that theory is bullocks because 45k is still in the safety margins the plane was designed for.
Re:Did Malaysian Airlines 370 disappear using SIA68/SQ68 (an... by knowaveragejoe on Monday March 17, 2014 @01:15PM (#7416434)
Wikipedia puts the service ceiling at 43,100 ft (13,140 m).

I imagine it could surpass that though without depressurization.