What is filled with people?
The airport is filled with people.
     src        edge_attr  dst
0      0  to the right of    9
1      0   to the left of   22
2      0               on    1
3      0  to the right of   26
4      0  to the right of   23
..   ...              ...  ...
167   28  to the right of   11
168   28   to the left of    2
169   29  to the right of   13
170   29  to the right of    9
171   29  to the right of   18

[172 rows x 3 columns]