There will be little requirement for airlines that fly to SH/LH holiday destinations primarily (VS, Condor, for example).
The crying need will be for increased cargo ops, and practical services providing links between centres of population. ( Fedex, UPS, and Flybe plus BA in part as examples)
I would suggest that only those companies that provide vital functions should be supported. And with no personal interest, might Flybe not be resurrected and perhaps nationalised?)
London City should not have been permitted to close either. It is too important for financial connections.