Yes and no.
To answer your question directly, if an aircraft with an air speed of 200mph were flying into a 300mph headwind, it's ground speed would be -100mph (in effect, flying backward).
In this case, the article states that typical normal cruising speed is 561 mph, and the jet stream was measured at 230mph (tailwind). That's a total of 791 mph (pretty close to the 801mph measured). If the plane were flying the other direction, into the wind, the jet stream would have to be over twice as strong for the plane to have a negative ground speed.
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In response to this post by JoesterVT)
Posted: 02/19/2019 at 2:34PM