Right well "Dublin Intl" is just "Dublin" or even "Dublin - Collinstown" but Dublin will do :o)
Servisair / Globeground - Passenger and Cargo
Sky Handling Partner or CRIT if you prefer - Passenger and sort of Cargo, sort of cargo = They do UPS for Chanex but the extent of that is offload and onload... Loadsheets already done. Open to corrections on that one...
Aviance - Passenger
Aer Arann - Passenger Handling / Flight ops / Dispatch... Ramp is preformed by Sky Handling.
Ryanair are self handling and no thrid parties
Aer Lingus same deal with FR
Menzies - Cargo
Then the usual suspects as in FBO/PARC/ICS/ICTS/Gate Gourmet/Fernley all with GH licences.
Few supervision companies with GH licences too... ACA/ATRS/Air Ops and SAS but they tend to stick to Supervision....
SAS/FLS/First Choice/City Jet/Aer Arann all have Engineering Depts
This is the full and proper list