It's important she exits the aircraft displaying the correct etiquette.
The royals, particularly the women, must keep their chin level to the stairs as they leave the aircraft.
This etiquette rule means the woman in question not only has good posture but also allows them to appear engaged with what is in front of them.
Kate Middleton: It's understood some guidelines only apply to the female members of the clan (Image: Getty Images)
Kate Middleton: There is one rule the Duchess has to follow when travelling by plane (Image: Getty Images)
However, they are permitted to hold onto the rail to steady themselves.