After Action Review Association of American Railroads After Action Report After Action Reviews Automatic Alternate Routing American Association of Railroads After Action Reports Air to Air Refueling Air to Air Refuelling At Any Rate Automatic Alternative Routing Average Annual Return accumulation-area ratio active avoidance reaction acute articular rheumatism After-Action Review Against All Risks Aircraft Accident Report Aircraft Availability Rate Airport Acceptance Rate Air-to-Air Refueling alkali-aggregate reaction antigen-antiglobulin reaction Association Of Authors Representatives abnormal anaphase resolution accelerated acute rejection Accredited in Appraisal Review Active Antenna Radar Active Array Radar adaptive autoregressive