Hi Giorgio,

I don't have B-707 yet, but I think you will find a "cold and dark" one, at:

LOCAL DISC > PROGRAM FILES (x86) > MICROSOFT GAMES > MICROSOFT FLIGHT SIMULATOR X > CAPTAIN SIM > 707 > FLIGHTS > 707-300 CAPTAIN COLD-N-DARK (KSEA). FLT (or something like)

Double click the file. Windows will ask you to choose a program to open it. Browse up to find MSFS > OK

Save the file as your B-707 "cold and dark" default flight.

Create a new flight from KSEA to another airport and follow all steps as you usually do.

Hope this help,

Pinatubo.