English to Russian Tech/Engineering Aerospace / Aviation / Space aviation, passenger flights

1. Cargo yield (cents/ltk) — what may be the meaning of LTK? TK probably means ton-kilometer, but what L stands for?
2. Cargo unit cost (cents/ctk) — it is probably “capacity ton-kilometer”, however, I can't find the Russian term for it. Is it something like «грузооборот в тонно-километрах»?

Thanks in advance.