How large is the airplane that is in the air?
The airplane is small.
    src        edge_attr  dst
0     0               of    8
1     1               of    8
2     1  to the right of    3
3     1  to the right of    2
4     1  to the right of    7
5     2   to the left of    5
6     2   to the left of    1
7     3   to the left of    1
8     3   to the left of    7
9     3   to the left of    5
10    5  to the right of    7
11    5      in front of    8
12    5               of    8
13    5  to the right of    2
14    5  to the right of    3
15    7               of    8
16    7   to the left of    1
17    7   to the left of    5
18    7  to the right of    3
19    8               in    4