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See also: Appendix:Variations of "aar"
- (international standards, aviation) IATA airport code for Aarhus Airport, which serves Aarhus, Denmark.
- (aviation) Aircraft accident report.
- (military, management) after-action report; after-action review.
- (computing) Axis2 ARchive file (extension
- (politics) Air America Radio
- (music) All-American Rejects
- (theology) American Academy of Religion
- (transport) Association of American Railroads