Meaning of 翼 in 不翼而飞 The Chinese idiom " 不翼而飞" contains the character 翼 meaning wings, but how could one fly without wings?

Here 不翼 = 无翼 ？ I'm confused.

I am aware of the fact that the saying means "vanish into the air or disappear without trace".

Thanks.
It means something disappeared as if it had flown away, and that something probably doesn't have wings.

It originally means words because words spread across the world without wings. Now it just means something disappearing into thin air.