It was to "finish" the design scheme if it wasn't red it would look like southwest took no time in the design department and Red/Blue are their colors
Did you really mean "airplane" - or did you mean airline . -If airline it is Qantas.
an airplane
It part of the tail.
Tail will tilt up
empennage
So that it can land like an airplane
in a conventional airplane it connects the wing to the control surfaces in the tail.
germanwings
radar
rudder
Jetstar
cool