The Gods may have chosen to withdraw from society. I can accept that.
As for the invisible jet, I'm fine with getting rid if it, but I think I'm remembering a different origin story than you.
The one I remember, pilot Steve Trevor crash-lands his jet on WW's hidden island (Pure, dumb chance? Did they make it visible for him?) The inhabitants of the island fix his jet - and they fix it good, mixing man's engineering with the magic of the Gods - thus, invisible jet. But, again, get rid if it.
Anywhoo, WW gets smitten with Steve and, basically, throws a tantrum so that she can escort him back to Man's world. (He's sick and needs help). It's decided that, since WW has never actually been to Man's world, she can go, partially as a learning experience for herself, partially to see if man is ready to become more peaceful and interact with the greek Gods once more.