Reference for Bava Batra 128:9

אלא מסיפא מכרן לאחר רבי עקיבא אומר אינו צריך ליקח לו דרך וחכמים אומרים צריך

and he must buy a right of way [to them]. This is the ruling of R. Akiba, but the Sages say that he need not buy a right of way [to them]' — 9 Now why<span class="x" onmousemove="('comment',' If the reasons are as given above, because of the objections to treading or flying. ');">¹⁰</span>

Jastrow