Germany's Air Berlin has agreed to defer delivery of 19 aircraft scheduled to arrive in 2012-13, as part of a continuing restructuring of its fleet.
Deliveries of new Airbus A320 and Boeing 737 aircraft for these dates will be "partly postponed" until 2015-16, said the carrier, under a deal with the two airframers.
Air Berlin said that it will instead receive 31 aircraft over 2012-13.
"Through this optimisation of its order books, Air Berlin's debt load is eased, in particular for the years 2012 through 2014, and the delivery of new aircraft is also secured until 2016," it added.
The carrier is pushing back 11 A320s and eight 737s.
Air Berlin added that the agreements are "an important step towards the optimisation of our fleet requirements in light of the current market conditions".
Investment requirements, based on list prices, will fall by $508 million in 2012 and $1.13 billion in 2013, it said.