American Airlines ticket numbers always start with the 3-digit prefix 001. In the aviation industry, every airline is assigned a unique three-digit numeric code by the International Air Transport Association (IATA) to identify their traffic documents and electronic tickets. This prefix is the first part of the 13-digit ticket number (e.g., 001-XXXXXXXXXX). Having the "001" prefix is a point of historical pride for American Airlines, reflecting its status as one of the first major carriers in the world. This number is used for everything from processing refunds to tracking air waybills for cargo. If you are flying on a codeshare flight operated by a partner like British Airways, but your ticket number begins with 001, it means the ticket was officially issued by American Airlines, which governs the payment and ticketing rules for that specific reservation.