But what about an airframe flying at 40 to 60 kts?
Bertie
I cannot give you an exact speed where there is enough air passing over an object to stop a snowflake from settling. In a car you may come to a stop at a road junction in which case the flakes will settle. They land on the car. There maybe heat coming from the engine at a standstill allowing the snow to melt and then the liquid to freeze on accelerating.
There is no such thing as sticky snow. That implies some sort of glue or stickyness which allows it to attach to objects.
True snow is dry and frozen so cannot attach to a frozen surface. Only visible moisture combined with freezing temperatures can attach.
Pace