How come an e-ticket is cost effective ? for airlines. Doesn't it cost more to keep the entire IT system up and running at all times ? Doesn't it cost more to store huge amounts of data on computers ? I once read an article where it stated that a paper ticket costs around 2$ . But surely it must involve more cost and risk to relay on a computer system ? What do you guys think? What happens if the IT system where all e-ticket information is held fails or crashes and all stored info is lost ?