See "For good flights" section.

1.Lengthwise and crosswise into half, respectively and open.
Then fold up at crosswise dotted line.
2.Make creases.

3.Fold up to creases to make new ones. 4.Fold up at creases made in Fig.2

5.Fold up at crosswise dotted line and lower two dotted circles overlaps with upper ones. 6.Fold down at crosswise dotted line.

7.Fold into half after attach with tape at light blue portion in Fig. 8.Fold at lengthwise dotted lines.

9.Open wings.(Refer to completion drawings below)

Completion drawing of "Seagull"
Orange portions in upper end of plane are elevators in this figure.