The miles I most often have to go chasing are the status miles from my originally booked airline, when I am involuntarily transferred to another airline.
This usually happens to me on my SEA/PDX trips where I am from time to time switched from UA to AS or from AS to UA. The trip itself is only 129 miles and takes only 35 minutes from take off to landing, but hey, it is 500
status miles each way and it only takes a phone call to get them.
I love miles.