If gravity decreases the higher we go along with air density, how much faster would a SR-71 Blackbird go if it were going against Earths rotation at top speed, at maximum altitude? Would it break 3000 mph? Or would gravity be strong enough to keep the jets thrusters from overcoming it?

If gravity decreases the higher we go along with air density, how much faster would a SR-71 Blackbird go if it were going against Earths rotation at top speed, at maximum altitude? Would it break 3000 mph? Or would gravity be strong enough to keep the jets thrusters from overcoming it?

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