I flew to IPC in March and its a bit of a strange one.
As others have posted, its domestic so you go to the right (as you are facing check in) for security/domestic flights and when you get to your gate, if you are there prior to 40mins before hand, the glass doors just before the gates will not open. You can see the gate, you can see others on that side of the gate but you cant get to it.
Instead, you sit in a nearby waiting area with a small coffee cafe, looking at the glass door, wondering how/if you will make your flight.
Slowly, you are joined by others holding similar boarding passes, so you tell yourself that if you are in the wrong place/will miss your flight then you are not alone.
Approx 40mins prior, the glass doors suddenly will open and you can finally access your departure gate.
In the meantime, anyone that arrived via international/managed to get in to the LAN lounge are no longer able to access your gate because the glass doors on the international side are now locked. So they have to exit the international side, go back through security via the domestic side and join you.