The lineage is the same type rating as the 170/190 common type. The Legacy 600 is a EMB-145 common type. The aircraft size is also quite larger than a G550. With that in mind, I think the pay would be more in line with an Airbus 318 Elite, Airbus 320 Prestige, BBJ 1,2, or 3. This places it in the aircraft category 6 payscales.