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SEATTLE (AP) _ Copa Airlines of Panama City has announced orders for six Boeing 737s valued at about $325 million and options for six more, boosting the potential value to about $650 million.

The orders and options, each for four 737-700s and two 737-800s, had been included in Boeing's published figures but were attributed to an unidentified customer, according to a news release issued Monday.

Pedro Helbron, said in the statement the planes were chosen for performance and lower maintenance costs.

Deliveries are scheduled to begin in October 2003.

Copa's fleet now consists of 10 Boeing late model 737s with two more scheduled for delivery this year. Delivery of all planes now on order will make Copa the largest late model 737 operator in Latin America and the Caribbean.