Every once in a while you see something and you have no idea what is going on. As a United 767 climbed out from O’Hare, it was streaming something from the fuselage. I saw it through the viewfinder at the time and figured it would be obvious what it was when I looked at the pictures. It turns out I still don’t know what was happening. Anyone reading this that has any ideas, please let me know what you think.
It’s fuel seeping from the overflow valve. When fuel warms up it expands, and when the tank is full it comes out of the overflow valve, which is located right in front of the wing, underneath the fuselage.
I’m guessing this was early morning and it had just taken off?
Thanks for the information. It had just taken off but it was late in the afternoon rather than morning. Good to know the source. Thank you for letting me know.