Athletic trainer salaries can vary based on location and level and even sport!
Certain areas pay more than others. For example, an athletic trainer in California can make significantly higher salary than somebody in Montana.
In addition, an athletic trainer at a high school or small college, working with say tennis or volleyball players probably won't make as much as an athletic trainer working with the New England Patriots. You can also search this website that compares salaries across many fields: https://www1.salary.com/Athletic-Trainer-Salaries.html
I hope this is helpful!