Seniority Rotation of Emergency Extra Trips. Unscheduled/emergency trips will be listed on the unscheduled /emergency trip list as soon as is practical after they have been received by the Transportation Supervisor or person in charge. Each driver and/or Transportation Assistant on the Unscheduled/Emergency Trip Rotation List shall be offered unscheduled trips starting with the driver/Transportation Assistant that is next in line in seniority, and/or is readily available. Drivers and Transportation Assistants who have mid-day runs shall report in writing to the Transportation Supervisor or person in charge when their contracted mid-day assignments are not scheduled and they are therefore available for day-time extra-trips.