Hopefully they have learnt from Volotea's lost interest that you need to provide the environment for these airlines to operate smoothly
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There seems to be an underlying assumption from many contributors that SOU is an untapped gold mine and that by fixing the infrastructure issues the airlines will come. Is there any evidence to support this? Any evidence that airfield issues impacted on Volotea's hand full of flights a week? Diversions, delays due to backtracking, etc
Airlines tend to find a way to work round issues if there is money to be made. LTN, BRS, LBA are hardly without their issues.