... or maybe the fact that the summer holidays have just begun may have something to do with it?
With full flights and exceptionally high amount of checked in bags it stretches resources.
I don't think Swissport are alone, having worked around the patch many companies in a lot of Airports have struggled with recruitment this year.
Also don't forget Swissport took on a lot of business after Aviator. From what I hear they didn't have much choice in the matter being the only other handler!