rq3 writes:

The wake consists of more than just the downwash you
are fixated on. If you have ever seen a sky-writer at work, you would
know, even without setting foot in a real aircraft, that it is possible
to return to the same parcel of air and pass through the smoke you had
left previously.

I never questioned that.

On a calm day, no descending or climbing is required.

How do you know? What skywriting have you done?

--
Transpose mxsmanic and gmail to reach me by e-mail.