There's no need to make all the effort to air-layer them. *Usually orchids are just divided and potted or mounted or whatever. *It's nice if you can get some good roots with the division, but not a big problem if you can't. *Just protect a new division from direct sun and excessive drying until it can get itself established. *It's usually best to wait until an orchid starts an active growth cycle before dividing or repotting it.