What is in front of the sky?
The aircraft is in front of the sky.
    src        edge_attr  dst
0     0  to the right of    9
1     2  to the right of    7
2     3           behind   10
3     6               of   10
4     6               of    2
5     7   to the left of    2
6     7   to the left of    9
7     7               of   10
8     9  to the right of    7
9     9   to the left of    0
10   10      in front of    3