It is for aerodynamics. It reduces wind resistance, allowing the plane to fly faster and/or use less fuel, or to use a less powerful engine to fly just as fast.
Boats have pointed front ends which make it easier for the boat to glide through the water.
Why were logs pointed on ends around a fort
a small and light boat with pointed ends
The ends of nails always made pointed because it help the nail to enter an object easy and faster.
To reduce friction. making the body streamlined makes the fluid friction less.
aeroplanes
Claws
long and pointed ends
The collective nouns for aeroplanes are a flight of aeroplanes or a squadron of aeroplanes.
the front of a dirt bike right in front of you mouth is pointed to make it easy to remove and pull over your nose
Eggs with pointed ends produce Roo's eggs with rounded ends produce hens!
A sadiron is a flatiron with a removable handle, pointed at both ends.