Description: a CAD management system design : CAD system function : to provide their customers with booking, a refund of the function, flight routes can browse information (such as flight number, route, time of flight and members of the amount set), and check their flight information; the CAD system is a concrete realization of the following forms : 1. the menu system to work two ways. flight information into functional (flight information in document preservation)-- input 3. flights information browsing-- output 4. inquiries route (flights inquiry) 5. contractors booking business and Refund
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