Civilian jet airliners don't need to push their yokes down to follow the curvature of the Earth because within the atmosphere the curvature is accounted for by automatical systems, right? I wonder whether there are jet aircraft (from the military, obviously) that actually have to push their yokes down for instance. The SR-71 Blackbird flew very fast (more than Mach 3) at very high altitudes (above 80,000 ft). Did Blackbird pilots have to be careful not to fly too much up due to the Earth's curvature, respectively not to cause a stall? Did Blackbird or other jet's pilots need to take other astrodynamics into account, such as rotational forces or other pitch concerns?