I think it's closer to 900 mph at the equator, and of course slower as one moves towards the poles.
In any case, in order to keep up with a ground point on the equator from a high altitude, one would have to travel a good deal faster than the 900 mph speed the ground is moving since they'd be at a greater radius from the center of the planet's rotation.
Same principle as for the earth's equator rotating faster than latitudes north and south of it, the circumference along the equator being larger than at those other latitudes. All points, regardless of latitude, take 24 hours to rotate once around. And when the circumference is smaller the rotational rate is slower, and faster when the circumference is larger. ie, a point along a relatively tiny 10ft-radius circle centered on the earth's north or south rotational point would still take 24 hours to revolve once.
Makes sense when thought about. So depending on the tilt of the ground track relative to distance from the equator, matching speed may be fun. Odd the article did not touch on that aspect.