usually this is a plum variety for peach

no problem to do this it's very easy.

I've had good results with different fruits air layer : plums - peach - pears and so on.

Thanks alcedo, do you apply root hormone to the limb when you remove the ring of bark?

derby
personally I do apply root hormone I prefer Clonex

I would like to give you a tip: only remove three quarters of the bark, keep intact the rest.

Thanks for the tip. I will give it a try. What time of year works best to attempt an air layer on a peach?

It depends on where you are your best choice is in spring when there is sufficient leaves grow.