Just like riding a bike.
With the recent crisis and grounding of so many aircraft and crews having to stand down, when commercial flights do start to resume, will crew just be able to start again just as they left off or will there have to be some sort of cognitive retraining?
With the issues of bringing back so many “parked” aircraft after so many weeks, will the first few flights by crew be a little tentative, or will it be just like riding a bike?