The other day I was spotting at Miami International (MIA/KMIA) and noticed something hanging out of the fuselage.
A man with a green jacket is holding a device attached to a cable. Can somebody determine what that is?
The ground crew has connected a headset to the communication jack outsiede for flight pushback communication with the flight crew. from b737.org.uk:
Here is a closeup of the connection point
Image from b737.org.uk
About flight interphone System
And here is a nose section of 737-200, showing it from a not so close angle.
Image from rigger.smugmug.com