fast...
To travel
Nobody did, because there were no successful airplanes then
Because that's more efficient.
foot,wagon
The invention of airplanes was so impotant because it could travel farther and faster and it became a new level of fighting in war.
Airplanes were invented because people wanted to fly like birds.
Travel and or shipping things to other places.
Because it is light and strong.
Airplanes reduce travel time. and they are also a safer way to travel.
Airplanes
we have airplanes for transportation, aka moving from place to place. It is the fastest way to travel at the moment. Other airplanes are used as fighters, which means they are used for shooting other planes, or for dropping bombs.
It made the world "shrink" because people can not travel to and across places which are previously inaccessible (e.g. airplanes can fly over mountains). Airplanes have also significantly reduced the time needed to travel from one country/continent to another. However, it also affected humans negatively because problems such as air and noise pollution soon appeared.