GHA? Like FBOs or the ones the airlines use?
if you’re running a bizjet charter through there I think
GHC runs a big (expensive) facility there
https://gchjetcentre.com/our-facilities/
if you’re talking about a big aircraft then yeah swissport or maybe these people
[email protected]
GHA - Ground Handling Agent:
Menzies, Swissport etc. Wonder who services QF/EK/CX/SQ etc