Delta Air Lines has ordered 26 Boeing jetliners, Boeing announced. Six 767-300 twinjets are new orders; Boeing also confirmed three extended range 767-300s, one 767-300, nine 757-200s and seven 737-300s previously unannounced.

Total value upon delivery of the combined order is approximately $1.8 billion, the company said, noting that the order establishes a new one-year record for the dollar value of announced orders at $47.7 billion. The previous record, set in 1989, was $46.62 billion.Delta, a kickoff customer for the 767 in 1978, has ordered a total of 57 of the widebody twinjets from Boeing; 37 of which have been delivered. It operates the twin-aisle airplanes on both domestic and international routes.

Since its first order for 757s in 1980, Delta has taken delivery of 60 of the quiet, fuel-efficient twinjets. Thursday's announcement brings to 20 the number of 757-200s still on order.

Delta now has 57 Boeing 737-300s on order.

One of Boeing's largest customers, Delta has ordered 354 of the company's jetliners over the past 23 years. Delta today operates 298 Boeing jets.