Reference for Bava Metzia 203:15

התם לא מיפסק ולא מידי הכא מיפסק כלי

Raba answered: [An object in] the air, in which it is not destined to come to rest, is not regarded as at rest.<span class="x" onmousemove="('comment',' The air above one's ground is accounted as the ground itself, in respect of an object that may enter it, only if it will eventually come to rest on that ground. Here, however, though the dung passes through the air of the landlord's courtyard, it will not come to rest there on account of the tenant's utensils, and therefore the air does not effect possession for him. ');">¹⁴</span>

Jastrow

Jastrow

Rashi on Deuteronomy