Combi
From PikkaWiki
A Combi is an aircraft configured to carry both passengers and cargo.
Aircraft refittable as (Combi)
In av8, (Combi) is a passenger aircraft refit which carries fewer passengers but more mail than a standard aircraft.
Aircraft refittable as (Airliner)
These aircraft have a high mail capacity by default, but are refittable as (Airliner) to carry more passengers instead.