"spirit" (sic) is not "flesh", and "flesh" is not "spirit". The two are not the same.
Joh_3:6 That which is born of the flesh is flesh; and that which is born of the Spirit is spirit.
Angels are not merely 'spirit', though they have 'heart'/'mind' and 'breath of life of God' (which is what spirit means in Psalms 104:4, and Hebrews 1:7,14), as it says they are 'ministering spirits', just as mankind was to be from the beginning (Hebrews 12:23).
Most people have a misunderstanding of the Bible's word "spirit". It doesn't mean an 'incorporeal shade'. That theology is spiritualism.
"Angels" (heavenly beings) are tangible beings of flesh and 'spirit' (mind/heart and breath of life of God):
1Co 15:38 But God giveth it a body as it hath pleased him, and to every seed his own body.
1Co 15:39 All flesh is not the same flesh: but there is one kind of flesh of men, another flesh of beasts, another of fishes, and another of birds.
1Co 15:40 There are also celestial bodies, and bodies terrestrial: but the glory of the celestial is one, and the glory of the terrestrial is another.
Isa_66:23 And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.
Consider Job 1 & 2, etc.
Do not confuse "image" with "likeness". They are two differing things. Study this out. Secondly, only was it given to mankind of this earth to "bring forth", "multiply", have "seed", etc. This is nowhere stated of the angelic hosts, among other things. God makes the distinction in Matthew 22:30; Mark 12:25, etc.
I have an entire study on angels if you desire, you may read it here -
https://ia801506.us.archive.org/7/items/michael-the-archangel-03-the-word-angel-as-defined-and-used/Michael the archangel [03] - The word angel as defined and used.pdf
Angels aren't aetheral beings (one error), and neither are they capable of procreating with mankind (another error), as they are a differing "kind" of being, as different as Cat is to Fish. Both having differing flesh, and thus so too, angels (angelic hosts) and mankind.
More may be shared, as I have a deep and thorough (no stone left unturned) study on this, with every word considered in its proper uses and context in the whole of scripture.