Peter Clark wrote:

Just to play devil's advocate, why would you need to cross the
extended centerline?

Unless the pilot is paying a lot of attention to the ground track, a crosswind is
likely to cause the aircraft to drift downwind a bit while climbing out. If you've
drifted to the right, a left turn will then take you across the extended centerline.
Since my aircraft has no rear view mirror, I can't be absolutely sure, but I'd bet
that I rarely track the extended centerline when the wind is up, especially at
unfamiliar fields.

George Patterson
In Idaho, tossing a rattlesnake into a crowded room is felony assault.
In Tennessee, it's evangelism.