The US Government Accounting Office (GAO) just released a report of the impact of VLJs on the US Airspace System.
Quotes from the report:
According to FAA officials, the agency currently has policies and procedures
in place to accommodate the entry of very light jets into the NAS because the
aircraft will operate similarly to other aircraft and will enter the NAS
FAA expects that the deployment of modern air traffic management technologies
will help to integrate very light jets in the long run.
Most experts GAO contacted believed that very light jets will likely
have little impact on safety due to FAA’s certification procedures for aircraft,
pilots, and maintenance.
The number of very light jets projected to be delivered (roughly 3,000 to 7,600) and
the dates by which those numbers would be reached (from 2016 to 2025).