They have the so called "red label" program, basically a career path, where a pilot will be chosen to lead a specific airplane and that one only, and a team of 4 more captains. The choice will be done based on merits and is a big recognition as they will fly with the most important customers and have some special benefits like doing their own roster. According to the company's preferences, seems like all the aircraft which are taking part of the red label program will belong to the Gulfstream family.