Rapid order processing and warehouse picking to expedite delivery to customers (with an option offered to a customer of paying a premium for express service) 
An airline reservation system allowing customers to request special meals to meet individual dietary requirements (with a provision for frequent flyers to have standing requests for special meals, fare class, choice of seat location, credit card billing, etc.) 
Add-on services <tag "515647">derived</> as a by-product from a basic customer service, such as a telephone billing system that gives a customer the option of receiving her bill summarized in user-specified ways &dash. for example, by area code, calling period, duration of call, or cost of call   

