I saw roots coming out of a couple of my air layered mango tree pods. The roots were coming out of the breathing holes on the side of a pod. These pods were stuffed with a 50/50 peat and perlite mix. Based on the results of different substrates, I conclude that fine coco coir, stringy peat moss and 50/50 peat and perlite mix, can be used to air layer mango trees. However, it must be used with Hormex no. 8 rooting powder. Also, I didn't have to close any openings on the pods and the pods are made to be kept moist from frequent watering from the top of the pods. The large size amazon pod in the picture doesn't have the breathing holes on the side. I don't like the ones with the breathing holes on the side because I will be damaging the roots coming out of it when I take the pod off.
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