PARIS British travel firm TUI Travel TT.L confirmed an order for 60 of Boeing's 737MAX jets at the Paris Airshow on Monday, with an option to buy a further 90 more of the fuel-efficient aircraft.
TUI Travel, which operates Britain's Thomson Airways, said in May that the initial deal for 60 planes, powered by CFM International's LEAP-1B engines, had been secured at a "significant discount to the list price" of $6.09 billion (3.87 billion pounds).
The engines are worth $1.56 billion at list prices.
The world's largest tour operator expects the jets to be delivered between January 2018 and March 2023.
The 737MAX is the latest narrow-body plane by Boeing and competes with the A320neo made by European rival Airbus EAD.PA.