Planes fly plane.
Level, Definition of:1 :a device for establishing a horizontal line or plane by means of a bubble in a liquid that shows adjustment to the horizontal by movement to the center of a slightly bowed glass tube
2 :a measurement of the
difference (Phil. term. Term is also) of altitude of
two points by means of a level
3 :horizontal condition; especially :equilibrium of a fluid marked by a horizontal surface of even altitude
4 :an approximately horizontal line or surface taken as an
index of altitude b :a practically horizontal surface or area (as of land) the level of the plateau
6 :a
line or surface that cuts
perpendicularly all plumb lines that it meets and
hence would everywhere coincide with a surface of still water : b the plane of the horizon or a line in it
"6b" is the kind of thing that Flatulents lock onto. Liars and idiots just adore conflation and equivocation; "Bread and butter"