"Flesh is flesh and spirit is spirit" -Jesus..
Apparently Jesus didn't share such a "flexible" sense of definition.
Jesus was always Spirit but became flesh for a season..
As Angels sometimes did that, appeared as flesh..
Angels are not flesh as Jesus was not flesh..
What appears permanent may not be.. We appear to be flesh also, yet we will live for eternity.. ALL OF US(some where)...
What is flesh and what is spirt/Spirit and what that means is occluded.. We are born on this planet absolutely sure we are merely flesh.. but some of us entertain the concept of "spirit".. as we learn more.. SOME DO NOT...