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AD. 1. GDS. Agent's discount. When followed by a number, indicates the percentage amount of the discount. For example: AD75 indicates a discount to travel agents of 75% off unrestricted coach fares. 2. Abr. Lat. Anno Domini, "year of our Lord." 3. Airworthiness Directive, an FAA rule regarding specific aircraft safety issues.
To find the abbreviation, acronym, or term you’re looking for, use the Search box (below) or click on any letter (above).