It has been decided by Delta Air Lines Inc. that 100 to 200 narrow-body jets will be used and decision over 200 more jets is yet to be taken. Some of the oldest planes in the U.S. industry would not be utilized further.

Yesterday, reorganization for employees on Atlanta-based Delta’s internal website has informed that last month they have sent large number of requests to several plane makers to provide them the required jets.

By 2013 all deliveries are likely to be received. The biggest commercial-jet makers are expected to provide the airliners. The list includes Airbus SAS, Boeing Co. and Bombardier Inc.

This is going to be a new record to order 200 planes at a time. It has been also informed that, this week India’s IndiGo Airlines is setting up to purchase 180 Airbus A320s. The total cost of purchase would be $15 billion. The oldest jets of Delta including DC-9s would be discarded.

DC-9s has an average 34 years of age and these have been included in the oldest aircraft in U.S. fleets.

A debt strategist at RBS Securities Inc. in Stamford, Connecticut, Jeff Straebler has stated that the Delta has the oldest planes among all other U.S. majors.