Source: Elines

Flight Attendants may request to drop their scheduled pairing the day before the trip by submitting a request beginning at 0001 HDT the day prior to the trip. Requests will be granted on a first come, first served basis, and are subject to operational needs. Additionally, a request can be made to drop a portion of a trip, if it transits the base on the day of the trip by calling Crew Scheduling. 

To submit a Personal Drop, you must submit a request through CCS between midnight and 1500 the day before the report time of the scheduled pairing or the Reserve day. 

Personal Drop requests can be submitted for the next day and the following day.

To submit a Personal Drop for a pairing or partial pairing on the same day the pairing is operating, you must directly call Crew Scheduling.

Note: Once a personal drop has been granted Flight Attendants will have the day/days that were dropped blocked with the PD indicator on their schedule and they will not be able to pick -up trips during the selected PD time frame.