German airline Lufthansa placed orders for 59 Airbus and Boeing aircraft worth over $18 billion in Fall 2013.
The order comprises 34 Boeing 777-9X long-haul aircraft and 25 Airbus A350-900s. The first of the aircraft will be delivered in 2016.
The new aircraft will replace older Boeing 747-400s and Airbus A340-300s, which will be phased out by 2025.
The Lufthansa group currently has 295 new aircraft on order with a list value of about $48 billion.
The under-development 400-seat 777-9X will be the largest and most efficient twin-engine commercial jet in the world with the lowest operating cost per seat of any commercial airplane, according to Boeing.
The A350 XWB (Xtra Wide-Body) is a new family of mid-size long-range aircraft with three aircraft versions seating between 270 and 350 passengers in three-class layouts.