From what I remember, it can be shown that if the earth is a perfect sphere, with a perfectly homogeneous mass distribution, ignoring that the earth is rotating and assuming the ride is perfectly frictionless and that movement is at essentially non-relativistic speeds, then a straight-line point-to-point gravity-driven connection will result in the same traveling time between any two points on the surface.
Reductionist and proud of it.
Being ignorant is not so much a shame, as being unwilling to learn. Benjamin Franklin
Chase after the truth like all hell and you'll free yourself, even though you never touch its coat tails. Clarence Darrow
A person who won't read has no advantage over one who can't read. Mark Twain