As you may have heard, many airports across the UK are experiencing severe disruption at the moment. This has been blamed on staff absences due to covid.
Even though the legal requirement to self-isolate has ended, many employers are still asking their staff to remain away from work while testing positive. That's before you consider the number of people who feel too unwell to work.
And the covid-19 case rate is now at an all-time high in the UK, despite - or perhaps because of - free testing having now ended for most people. As a result of all that, multiple airlines, including Jet2, Easyjet, and British Airways, are cancelling services as they don't have the staff to run them.