Far below

I love this shot of an airliner and vapour trail, but taken looking down, rather than looking up:

15760017353_7164125ce7_kFellow Traveller by Alexander Gerst

Alexander, in case you hadn’t worked it out, is one of the astronauts on board the International Space Station, and that plane is flying at about 2% of the altitude he and his colleagues are at. And probably a good deal slower as well.