Flight attendants are the "eyes and ears" of the flight deck! In the event of an emergency, the pilots' primary duty is to maintain operational control of the aircraft resolving any issues as quickly and safely as possible. The flight attendant's primary duty is to prepare the passengers and cabin in the event an evacuation is necessary once on the ground. From instructing passengers to place on life vests or smoke hoods to securing the cabin, having an industry TRAINED flight attendant onboard is vital for the safety of EVERYONE onboard.
For those flight departments and CEO's who choose not to employ a flight attendant, consider sending the executives or the principal through an inflight medical and emergency evacuation training program. Flight department personnel may feel more at ease if their passengers know how to assist and evacuate an aircraft in an emergency.