Just looking at Luton
If someone on Christmas Day had told me that Luton would be handling just a thousand or so passengers a day by Easter Sunday and that RAF C17's would be doing touch and goes I would not have been able to think of a reason why and yet this is the position the airport finds itself in.
Looking at the 2019 annual report under Principal Risks and Uncertainties losing 99.9% of their passengers at the start of the new financial year was not listed.