The uniformitarian origin INsect flight
The best theory on the origin opf insect wings, as formulated bu Kukalova-Peck, porposes that wings are developments of
We can go further by looking at the structure of insect wing motion.
It is oscillatory, and definitely produces sound. Insects communicate universally using sound. This especially was useful for pre-flight insects, which being small and because of the short-focal lenght of their eye lenses, have difficulty finding each other
, unless swarming.