Sorry i am a noob to this site, but wanted to ask a simple question that i can't get a answer for. I was browsing through the Nation Master United Parcel Service Agreement and came across Article 40 Section 1 (9). Shuttle work currently being performed by part-time air drivers shall be converted to full-time air driver work when the driver vacates the job except when there is not enough work available to create a full-time job. Can someone please explain this statement? Thanks in advance.