Effectiveness of a plane

In this graphic I pretend to demostrate that in nowadays people spend a lot of money in trips. This fact help us to see the differences between rich countries that they can afford travel and poor countries that they haven't the same luck.
Although we see that not all of the airports are rendible because sometimes there are a few people that travel in plane. This fact is understable because planes are empty.
I think that in nowadays the plane is the most efective transport for travel. It's a transport very fast, efficient and safetiness.
In this image we can see that in every year there are 237 million empty seats or planes equal.