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A comment on Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-Breaking Speeds. Parent comment

Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by microcolonel on Tuesday February 19, 2019 @05:32PM (#19203557)
That's less error than slopes and oblateness introduce, so I think it is acceptable.
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Re:Boeing 787 Reaches 801 MPH as a Jet Stream Packs Record-B... by ummonk on Tuesday February 19, 2019 @06:39PM (#19204131)
That is also an interesting question. If they’re measuring speed as if the airplane were at the surface rather than at 30,000 feet, is it speed along the WSG84 earth model?
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