It's not a BBJ, it's a 737-500 in business class configuration.
The kid was hired as a Hawker 900 pilot because his father made an investment in the plane when it was first delivered. Very low time, no heavy jet experience, no PIC.
Other guy being promoted to fly the 737-500 also no PIC experience, 605 and Sovereign copilot with about 2500 hours.
Interesting pair to send up in a large aircraft.
But, then, this aircraft operates under no AOC, being operated as US FAR Part 91 operation despite being a public commercial aircraft - we've discussed that a page or two back - so no regulatory oversight of any kind.