Typically sound follows the inverse square rule, so the difference between the same plane at 1000 feet should be a 1/169th (1/13^2) of the noise at 75 feet. So

Typically sound follows the inverse square rule, so the difference between the same plane at 1000 feet should be a 1/169th (1/13^2) of the noise at 75 feet. So two orders of magnitude.