I know pilots flying 14 hr flights and never nose the plane down to make up for some fake curvature.
Inane comments like this don't really advance the concept of Flat Earth, and the fact that you seem to "know pilots" compounds the apparent ignorance.
Further to the maths and all that others have mentioned, pilots flying "14 hour flight" don't actually push, pull or even steer anything from shortly after take-off until approaching to land; its all done by the autopilot. The Altitude Hold function of this is accomplished by inputs from an air-data computer (ADC) which, in turn, receives an input of ambient atmospheric pressure from sensors on the side of the fuselage. All commercial flight above Flight Level 290 (approximately 29000 feet) has to be done by aircraft certified to something called Reduced Vertical Separation Minima (VRSM), which means that the aircraft's altimeters have to be calibrated to very high standards. Aircraft operating in VRSM may only be separated from other traffic vertically (height) by only 1000 feet, so variations of more than 300 feet are illegal. (Just think about that for a second; they are 8 miles above the earth, and keeping height +/- 100 yards, purely on air pressure). So as the plane flies along it varies up or down by a couple of feet; if it descends, the pressure rises, ADC tells the autopilot, autopilot trims the nose up a little, and so on. Just the same way the Course Hold function is monitoring the heading to the next waypoint; plane veers slightly left or right, autopilot sends appropriate inputs to the lateral control system. Just the same way that your car's Cruise control is constantly measuring velocity and constantly tweaking the amount of gas put out by the fuel injection system.
Even if the aircraft was being flown manually, the pilot would be constantly adjusting up, down, left, right for the same reason, but just not as efficiently. If you think that the pilot could identify which bit of "push" is for curvature from which bit is due to turbulence, you are demonstrating that you just can't conceive how big the Earth is, and how small you are.
So there is no "push" to accommodate curvature; its constantly pushing, pulling, turning to achieve the altitude and heading demanded by the pilot. And, of course, it would do it exactly the same if the Earth was flat, or indeed a Paralloid Tetrahedron. (Don't Google that, I just made it up).
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