What aircraft is flying?
The aircraft is airplanes.
    src        edge_attr  dst
0     0  to the right of    7
1     1  to the right of    7
2     7   to the left of    0
3     7   to the left of    1
4     7   to the left of   13
5    11  to the right of   12
6    11               in    3
7    11               of   10
8    12   to the left of   11
9    12   to the left of   13
10   13  to the right of   12
11   13  to the right of    7