Agree with David above, the first answer is inevitably "no" so you have to be persistent. However to answer your question; normally the airline appoints a handling agent who provides check-in, manning of departure gates, loading bags into aeroplanes, removing bags from aeroplanes and delivering to reclaim and dealing with airbridges/steps and the push-back operation. May even provide some engineering support.
Who the agent is will depend. If the airline only has a couple of movements / day, they maybe subcontract to an "existing" agent. If they have enough flights, they may have their own staff. They may subcontract from an independent company (like Menzies) or an associated company (for example Norwegian Air Shuttle and Red Handling.) The changes are the handling agent has service level agreements with the airline so if compensation is paid to passengers (or to the airport) they will foot the bill if they failed.
As they say "it all depends".