Are there any airplanes?
No, there are no airplanes.
    src        edge_attr  dst
0     0   to the left of    5
1     1  to the right of    3
2     1  to the right of    9
3     1  to the right of   13
4     2   to the left of    8
5     3   to the left of    1
6     4   to the left of   12
7     5  to the right of    0
8     7  to the right of   15
9     8  to the right of   13
10    8   parked next to   14
11    8  to the right of    2
12    8  to the right of    9
13    9   to the left of    1
14    9   to the left of    8
15   10   to the left of   12
16   12  to the right of   10
17   12  to the right of    4
18   13   to the left of    8
19   13   to the left of    1
20   15   to the left of    7