The scriptures say spirit is air. In fact, there exist no distinction between spirit and air in the original languages, they are the same word. So in fact, you saying spirit is not air is like saying a car is not a vehicle. They are synonymous. But because of your lack of understanding, you think they are two completely different things, when in fact they are the same thing. Now, let me educate on the two kinds of spirits there are,
1. There is the spirit that is air. Gives us all life, men and animals. We all breath it to live. That is our spirit, which gives us consciousness and awareness. Once that breath departs, our body and soul dies. The body returns to the ground, the soul goes to Sheol, and the spirit returns to the air.
2. Then there beings are made of spirit, which are not bodies of flesh like you and I have, but bodies made of air, hence why spirits are invisible to the eye, and also able to enter our bodies, through our breath. Just like angels can turn into fire, like the angel that appeared to Moses in a burning bush, angels can turn into air. Any being that is turned into air is then called a spirit. If he is a being from above, as in a holy angel, then he is called a holy spirit when he takes this form. This body in the form of air is also what is called a "spiritual body", because it is body that can take form of air.
I have an expanded study on these matters with scriptures in these two studies,
The Soul and Spirit of the Natural Body, and the Spiritual Body of the First Resurrection | Wisdom of God
The Holy Spirit is an Angel, and Each Believer Receives a Holy Spirit | Wisdom of God
These are literal things.