At headmaster et al flat earthers - the earth is rotating at a speed at the equator of about 900 kts. Lucky when when we change direction and walk East to West, our momentum doesn't change by 900 kts worth.
CHANGING DIRECTION WITH A CONSTANT BANK ANGLE IN A CONSTANT AIRMASS DOES NOT CHANGE THE LIFT ON A WING
L= 1/2 CL rho V^2 S
The V in that ole formula is not Groundspeed.