Not every crew member needed certified, just the head installers - though it quickly became a way for workers to get ahead, and now you can find whole crews that are certified in this way. (skepticalob.com)
«I think the whole crew was happy when we lit that up.» (businessinsider.com)
These include making sure the plane is properly maintained before departure, the whole crew is present before the flight, the flight leaves on time, service on the flight is top - notch, the plane door opens one minute after arrival, and the last bag is delivered to customers within 15 minutes of the aircraft parking. (fortune.com)