Capacity Booster
Modern commercial airliners are filled with backups to the backups, all designed to get us to our destination safely and efficiently. There are multiple autopilots and flight control systems, secondary hydraulic and electrical systems and two engines. The pilot and co-pilot are even server different meals, so should one of them come down with food poisoning, there is always a backup. Operators of communications satellites face similar demands in maintaining service, which are compounded by the orbital location of their satellites: over 22,000 miles above the equator.
