Sox,
Read Gann's book "Fate is the Hunter" and you will understand just how important "seniority numbers" are in the airline world. The only difference between the GOM and airline pilots is their equipment and seat they occupy are in fully instrumented IFR aircraft. The GOM thrives on Jetrangers and similar VFR aircraft although IFR aircraft are becoming more common.
Pilots bid for their job, aircraft, and bases based upon seniority....same as the airlines.