United Parcel Service

(UPS) - Get Report

said Tuesday it ordered an additional 60

Airbus Industrie

A300-600 freighters with a list price of $6 billion.

The order -- the largest aircraft deal in company history -- includes options for an additional 50 aircraft. The package delivery company previously placed a firm order for 30 of the aircraft in 1998 for service within the U.S. Seven planes have been delivered with an additional 13 on the way this year. The latest order supersedes options for 30 aircraft in the 1998 deal.

The acquisition of the aircraft will be spread over a nine-year period and will be added to the company's fleet of 238 jets. UPS, which late last month said it was raising its

rates, said international export volume climbed 23% in the third quarter from the year-ago period.

Shares of UPS, which is based in Atlanta, dipped 25 cents, or 0.4%, to $60.81 in recent

New York Stock Exchange

trading.