An ADM is a charge an airline raises against a travel agency, usually through BSP, to recover money when a ticket was issued or handled against the airline's rules — for example a wrong fare or tax, an unapplied penalty, a fare rule violation, or booking practices the airline prohibits. An ACM is the reverse: a credit the airline owes the agency.
Also called: agency debit memo, agency credit memo.
Why it matters
ADMs land weeks or months after ticketing, so they erode margin quietly. Agencies reduce them by pricing through the GDS rather than manually, respecting fare rules on reissues and refunds, and avoiding duplicate or speculative bookings. They can usually be disputed within a set period through BSP.
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