My compamy is going through some internal strife over this question. Maybe someone can shed some light on this..... As a 135 operator, when the paying customer is off the airplane, and we are operating the aircraft part 91 on the way home. does 135.267 time and duty still apply to the flight crew? My understanding is that because we are a commercial operator, the flight crew is required to adhere to 135 time and duty regardless of what part the aircraft is being operated under. Any input on this would be helpful.