For Summer 21, unless we're bound by similar to current restrictions and quarantine measures, recovery in volumes by the low-cost operators (Ryanair and Wizz predominantly) would likely be pretty swift, in excess of 70% of 2019 levels I don't think would be unrealistic if travel restictions ease. But any growth will be unbalanced and fragmented. The majority of carriers who are more yield rather than volumes driven, especially the full service and business traffic, will take longer as for pricing we're talking more years as opposed to months for a recovery.
Airports are desperate for volumes to return since the bulk of their revenue comes from passenger related, non-aeronautical streams. Gatwick charging £5 for drop-off next year and big increases by MAG in drop-off charges, all this is to allow more competetive pricing to airlines in a bid to win back traffic volumes. Airports in Scandinavia and Germany as examples who generally have expensive handling and operating costs will lose out to those who can offer effecient and cost effective solutions to the likes of Ryanair and Wizz who will drive the volumes recovery. Even those traditionally more expensive, full-service, business travel airports will be unlikely to resist the need to turn to the low-cost carriers to secure and safeguard their business for the future. It truely will be the biggest race to the bottom as far as airports are concerned we've probably ever seen.