A conditional purchase offer (CPO) management system is disclosed for receiving CPOs from one or more customers, such as airline passengers, and for evaluating the received CPOs against a number of CPO rules defined by a plurality of sellers, such as airlines, to determine whether any seller is willing...http://www.google.de/patents/US6085169?utm_source=gb-gplus-sharePatent US6085169 - Conditional purchase offer management system
