Swissport at not the only one struggling. Menzies are now (temporarily) offering double pay overtime. Swissport have been offering triple pay overtime for some time now and added to the enivitable penalty clauses, it makes you wonder what their cash flow situation is like. Not too healthy I'm guessing.
Airlines with big operations like RYR and TUI really have no other options in the short term at least. There was talk of RYR going quasi-self handling similar to DHL with EZY pre covid but has all gone quiet since.