Earth’s very surface is our horizontal path of direction
So you think the face of a cliff is horizontal?
You think a mountain side, or the side of a hill is horizontal?
Then you are a complete imbecile.
But we both know that isn't the case.
Instead, we both know you are wilfully lying to everyone.
Desperate to try to pretend Earth is flat, so you come up with this pathetic lie, all to avoid admitting what horizontal actually means.
But notice the bigger problem with that claim for you.
Image Earth is a perfect sphere.
If the surface is our horizontal path, and the air also provides a reference for that; why does that mean that that can't happen on this hypothetical, perfectly spherical Earth?
When a pilot adjusts a flight, he knows why he’s adjusting the flight for a reason
So all pilots are men now?
And yes, they do. For example, they know they need to trim the aircraft to pitch up/down if their attitude is not correct.
They don't care why it isn't correct.
It could be because a fat guy came to the front of the plane, or it could just be the curve of Earth.
Likewise, if they are climbing, they adjust to maintain altitude. They don't care why.
That will naturally account for the curvature of Earth.
But what does any of that have to do with what horizontal and level means?
Again, what does horizontal and level mean? Try not using stupid crap like Earth's surface which is known to be rough and irregular; and don't say flat.