Cargo carrier jumpseat question
I couldn't quite find the answer to this question: Can one jumpseat on cargo carriers (UPS/FedEx/Atlas etc) internationally? I'm in CASS and know how domestic jumpseating works, but I am not clear on how it works internationally. As I understand it, domestic jumpseating on FedEx, for example, is first-come first-served via the 24-hr jumpseat line, but how does it work internationally?
Any advice would be great.