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Firstly, Wright brothers who invented the airplane would not be famous anymore.
Secondly, with no airplanes, trains and ships would be extremely popular for long distance travel.
Thirdly, with no airplanes, travel time will increase by a lot, people will rarely travel across countries. Tourism industry will not be lucrative anymore.
Fourthly, with no airplanes, worldwide defense industry will look very different. Tanks might make a comeback.
Fifthly, with no airplanes, humans will look to the sky, watch the birds and wish that one day even they could fly with them.
Also, with no airplanes, people might start watching their favorite places on TV instead of traveling far-off distances to visit them.
On the flip side, with no airplanes, pollution levels will go down worldwide.