Just looking at FR24 and the number of survey aircraft out & about this weekend
PC6 D-FIBE
Be200 EC-MME
Be200 G-RAFK
Be90 G-WKTO
Be90 G-WKTS
PA31 PH-PNY
Be200 PH-SLE
PA31T PH-SYV
. . . . all of the above are operating out of PIK so fuel revenue, landing & parking revenue to them, and local hotels & restaurants benefiting too
Quite clearly bringing everything 'in house' some years ago has paid off . . . everybody is aligned to bring in revenue to the business, none more so than military traffic (but of course the airport is making more money out of conflict)
What incentive have Gama or Signature got to do the same at Glasgow? I suspect, none