What is the airplane in front of?
The plane is in front of the trees.
    src        edge_attr  dst
0     0  to the right of    9
1     1             near    3
2     2           inside    8
3     2          driving    8
4     2               in    8
5     3             near    1
6     6           behind    8
7     6  to the right of   11
8     8       driving on    3
9     8               on    3
10    8            above    9
11    8      in front of    6
12    9               of    8
13    9   to the left of    0
14   10               on    8
15   11   to the left of    6
16   11               of    8