Hiện nay

1. Actual Time of Arrival
2. Air Transport Association
3. American Trucking Association
4. ASTRA - also ATR
5. Automatic Trouble Analysis
6. Advanced Tactical Aircraft
7. Anaerobic toxicity assay
8. Analog Telephone Adapter
9. ARCNET Trade Association
10. Atlantic Treaty Association
11. Aviation Training Association
12. Atmosphere absolute
13. Advanced Technology Attachment
14. Agrarische Termijnmarkt Amsterdam
15. Air to air - also A/A and AA
16. Alimentary toxic aleukia
17. American Tinnitus Association
18. Acetate - also ACA, AC, Ac-, ACE, AA and actt
19. ANTARCTICA - also ANT and AQ
20. Autoantibodies - also AAs, A-Ab, AAB, aAbs, AutoAb, Abs, AB, autoAbs and AA
21. Apogee Technology, Inc. - also APGT
22. Autoantibody - also autoAb, Ab and AAb
23. Air Transport Association of America - also ATAA
24. Atrial tachyarrhythmias - also ATAs, AT and ATs
25. Average Time to Abandon