It's a pretty good bet that JMC has a warehouse, single hangar dock, and office point in Marduk (they also have one in Kandor, naturally). In fact, any truly major settlement will have at least a field office to establish a JMC presence in an area, even if all they're doing is that and an airlock to move cargo through to a waiting Blue Midget (which is typical of smaller settlements that are large enough for a presence, but not large enough for a docking facility of even a single hangar to be constructed.)
--
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor
--
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor