"20-I-6-h-(3) A Reserve may be given an add-on reassignment that begins after the completion of his current Trip. Such reassignment must comply with Section 20-L. A Reserve who is given such a reassignment shall not be given a subsequent assignment or reassignment under the provisions of Section 20-I-6-h without his concurrence."

This is a frequent one from what I've experienced. They change the trip at every hub, often extending the trip to the max days of the reserve block, ending the trip only when you're about to go illegal or hit an immoveable day off. I had one pairing last month that went to a "D" modification and another that went to "L." Some of these changes were not Reassignments but hotel changes, for there were some Reassignments as well. From what I can see, no more. This change will require the trip to end after one modification and then give us 12:45 in domicile between trips.