Where is the airplane?
The plane is in the airport.
    src        edge_attr  dst
0     1   to the left of   20
1     1   to the left of    7
2     1   to the left of   19
3     2  to the right of   21
4     2  to the right of   20
..  ...              ...  ...
56   21   to the left of    9
57   21  to the right of   20
58   21   to the left of    5
59   21   to the left of    6
60   21   to the left of    2

[61 rows x 3 columns]