Many aircraft can easily accelerate to 30kts or more at idle, that’s a tad faster than walking pace 
Btw, the F-15 doesn’t slow down at idle below ~90kts after touchdown.
Many aircraft can easily accelerate to 30kts or more at idle, that’s a tad faster than walking pace
Btw, the F-15 doesn’t slow down at idle below ~90kts after touchdown.