American Airlines has a whopping $200 change fee on paid fares (other than full fare refundable tickets) for domestic flights, and up to $450 for international flights. Same day changes are $75 in economy and free for business and first class passengers on paid fares.
legal Definition of capias ad respondendum : a writ or process commanding an officer to place a person under civil arrest in order to answer a charge Explore M-W
It would be my best guess that the abbreviations would distinguish between a capias pro fine warrant (CP) and an alias warrant (AW). A capias pro fine warrant would be one issued by the judge from the bench when an individual has failed to satisfy a judgment according to its terms.