What is the airplane in?
The plane is in the air.
   src        edge_attr  dst
0    1        flying in    9
1    1               in    7
2    4  to the right of    5
3    5   to the left of    4
4    6               in    9
5    8   to the left of   10
6    8  to the right of   12
7   10  to the right of    8
8   12   to the left of    8