I doubt the tree is J. virginiana. It is much more likely something else. Could be J. chinensis. The reason is that with very few exceptions, ERC is a bolt upright tree. J. chinensis will do exactly what the tree in the photo will do without much human intervention. An eastern red cedar, J. virginiana,, would require yearly effort by the home owner to make it lay down like that. J. virginiana make telephone pole trunks.
So not being eastern red cedar is a plus for this tree.
IF you dig it up, let it establish in a pot for a year or two before starting your air layers. Start them too soon, and you risk killing the air layer and possibly the tree entirely.
This could be 'Blaauw' juniper which in many ways is similar to J. chinensis, it is a hybrid between J. chinensis and the european juniper. 'Blaauw' was a cultivar selected and planted very widely in landscapes through the 1960's thru 1980's before it fell out of fashion. It works reasonably well for bonsai.