I continue follow this course until at 3.48.I confuse the way you get a same body for the plane .Did you use Duplicate Tool or some thing?I try to continue by duplicate(Alt+D) the plane body for body and body_block so i can continue the video then i face another problem when i try to delete the tail and the head of the body
(Tab + Z + B + X) i got this
and after i exit edit mode it i got this
Have I done something wrong?
By the way I use Blender 2.79