....for more than 19pax you will need a flight attendant...
(plus F/A station, facing towards the passengers, all emergency equipement available from the station, eventually a second F/A, if cabin is divided... + F/A must be properly trained with emergency training etc... - it is common practice to have some inflight-service-persons instead of "real" flight attendants.)
i guess, thatīs the reason gulfstream has not put any effort in certification for more than 19pax
my 2 cents
welle