contrail |ˈkɒntreɪl| = vapour trail (Origin: 1940s: abbreviation of condensation trail):
A trail of condensed water from an aircraft or rocket at high altitude, seen as a white streak against the sky (also called "aviaticus" cloud).
This brings to mind travel and holidays in distant warm countries as the temperature drops here in wintry Melbourne...
This post is part of the Blue Monday meme,
and also part of the Through my Lens meme,
and also part of the Seasons meme