Ballyboley,
Atlas is a member of CASS but only infrequently flies through STN. About twice a week through PIK but then to LUX and then back to the USA in HSV.
Flightmech is correct that the Fedex jumpseat international is for their employees ONLY. Same with UPS.
Be more specific if you want help. Whom do you work for and where are you trying to go?
Anothercargopilot