Wirelessly posted (BlackBerry: BlackBerry8530/5.0.0.601 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/417)

US Airways miles are expected to eventually become AA miles, so as long as your US miles do not expire before then, you'll have 3K more AA miles.

Chase UR points can be converted to UA miles. And I believe that Amex MR points can be converted to JetBlue True Blue points. Whether it's worth you while to do either of those conversions is another matter.