I notice sometimes when passengers see a captain go to the bathroom they get a little anxiety because they think the co-pilot is not experienced enough to fly. I had passengers ask me with concern who's flying when they see a pilot go to the bathroom. Even today there was an incident involving a Continental Airline B-777 flying from Europe to Newark who had the captain died on the flight. This is not the first time this has happened nor will it be the last. People die that is a fact of life. It doesn't matter if it's in an airplane, a car or on the street. When it's your time, then it's your time. But when it happens in the cockpit on an international flight, although unfortunate the flight will continue. It's not an emergency event. There are always two or more pilots on international flights depending on how long the flight is. These extra pilots are called relieve pilots. They only fly in cruise flights to give the original crew a rest period. Many times these relieve pilots may not have made as many takeoff's & landings as the original crew or line holder as we call them in the airlines, but they are full functional & competent pilots that are capable of landing the airplane. So it shouldn't even be an emergency event as the media somethings make it out to be. Captains & First Officers both go through the same exact training at the airlines. Many airlines consider First Officers a captains in training. The only reason the captain is the captain is because of seniority. It just happens many times that the captain may have more experience because he or she was employed at that airline longer. But many times the first officer may have more experience in the airplane then the captain. It's also important to know that we don't use the term copilot any more. It's a way outdated term. It's Captain & First Officer both are equally qualified to handle any emergencies.