In article , Marian Aldenhövel
writes
Hi,

I'm prepping for a presentation and was wondering: who was the first to
actually thermal.
I recall reading about someone who flew in a BE2 (I think) from Issy Les
Molineaux to Cambrai (I think it was Cambrai) with their motor idling.
In 1916.

From On Being a Bird, Phillip Wills.

Sounds like someone discovered cloud streets.
--
Mike Lindsay