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