That was my initial thought

We did a few inter island hops with Hawaiian a few years ago and found the ramps great. Easy for families with young kids, elderly etc. My teenage daughter ended up injured and on crutches during the trip and these ramps made it much easier boarding aircraft than standard steps.

A fair point, ANstar, and I should have been more careful in what I said. However, from a passenger’s perspective they are dealing with the airline (regardless of which one); the airport services may be contracted out, but the passenger has no direct relationship with them. If the fault for the non-provision of a service lies with a subcontractor, it is still up to the airline to resolve - whether on the day, or in terms of renegotiating the contract with the supplier. The legal relationship between the airline and subcontractor matters not one jot to the person who has been left behind, for whom it is often a matter of dignity and respect. Indeed, for any organisation to then blame a subcontractor (however fairly!) would likely come across to the person affected as passing the buck, and shirking a legal and moral responsibility.

I suppose a comparable - though less extreme - example would be the non-provision of a meal on a flight. While this might be due to Gate Gourmet (or whoever) screwing up an order, the passenger will understandably be annoyed with, and take it to with, the airline - and it will be up to the airline to do service recovery.