فإن الجامع بين العدو والطيران هو قطع المسافة بسرعة
For the common feature of running and flying is rapidly covering distance.
ʿAdw: advancing quickly by running on the ground.
Ṭayarān: moving by flight through the air.
Common feature: speedy traversal of distance.
The activities do not agree in every aspect. Moving on legs and moving by flight are distinct modes. The metaphor selects speed and traversal as the ground of resemblance. Treating every property of the two activities as identical would defeat the purpose of explaining the transfer.