I've been tracking various flights from US cities to PTY as Copa keeps moving the goalposts on restarting. What I generally see is well sold flights for the first day of resumed operations, sometimes even sold out flights. Then on subsequent flights the demand drops off greatly.
Nobody will want to fly internationally for tourism or business until it's assured that no mandatory quarantine policies will be in effect on arrival. We can expect a hodge-podge of varying and possibly crazy rules out of all the countries Copa serves.