He did a terrible job. The amount of routes and airlines lost especially under his leadership is staggering.
However I think GLA's problems are deeper than Derek Provan. AGS as an organisation and their billionaire owners don't care. The terminal is a dump, the connectivity to Glasgow CC is poor, not competitive enough to retain low cost airlines, long haul carriers.
Then there's the political component. Between Brexit, APD, covid, political focus on propping up PIK in the west, the green agenda, absolutely no movement on the rail link. Its the worst political environment possible for the airport.
Also the growth of EDI has been hugely detrimental. Its scary when you compare the job GIP/Dewar have done versus AGS/Provan.