There is a book called Killing Pablo which is about the hunt and ultimate killing of Pablo Escobar. Part of the book talks about him building up his empire. At the height of his power he was sending multiple jets full of drugs into the US. They didn't even care if one got caught because the other 10 didn't.
The same can be said with mules. The risk of sending them through the airport is actually less than having them try to cross the border and hike. There are a few reason. First, carrying that amount of drugs in your system is dangerous. The more you move around the more chance there is that something will break and kill the carried. Rafting across a river and hiking through the desert takes a good amount of physical activity. Second, unless they can get someone to meet up with the mule pretty quickly they are left on their own. Mexican border towns are often not safe and any number of things could happen to a person walking through the desert. You could fall and hurt yourself, get lost, get bit by a snake, get picked up by the police etc.
It is a much more streamlined process to just send them through the airport knowing a few might get caught, but most will not than to risk having them wandering all over the desert and hoping they make it to their destination.
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