I found a neat way to refresh my AAdvantage miles and rack up more. By linking your AAdvantage account to Sprint you can get up to 5,000 points a year credited each month you remain active on the line and in good standing. New users also get 20,000 points for switching to Sprint. More information on the offer here.
We had already switched lines from T-Mobile to Sprint 3 months ago so no sign-up offer. The monthly points did get credited, however.
On a side note, be sure to read the disclaimers if you are receiving some sort of a monthly discount. In my case I was on the 50% switch plan for T-Mobile and it wasn’t affected. For Sprint customers, especially those without any sort of monthly discounts this basically offers free AAdvantage miles.