Honeywell International Inc. has new contracts totaling an estimated $6 billion for its HTF7000 engine. The names of the buyers have not been named. Honeywell made no official announcement, but the news was revealed in a corporate presentation posted online.

The HTF7000 is a turbofan engine designed for commuter jets and business jets, and already chosen by OEMs that include Bombardier Aerospace, for its Challenger 300 long-distance jet, and Gulfstream Aerospace, for its G280 twin-engine business jet. Embraer and Avro are other jet builders

The engine is part of Honeywell’s part of the HTF7000 Propulsion System that reportedly has listed 100,000 flight hours since its introduction in 2004. The builder also emphasized the maintenance efficiency — maintenance being an important aftermarket for aerospace suppliers and builders.

The new jet engine orders are among of $19 billion in long-term contracts that Honeywell Business Aviation has landed in the past three years. Aerospace – including commercial and defense, is among the industries that Honeywell supports. It develops and manufactures mechanical and electrical products used in numerous commercial- and defense-related aircraft platforms. Honeywell said its commercial jet unit has won contracts totaling $28 billion in the past three years, including control systems for Boeing’s 737 MAX jet.