Leeham News and Analysis
There's more to real news than a news release.
Leeham News and Analysis
- Bjorn’s Corner: Air Transport’s route to 2050. Part 25. June 6, 2025
- New RISE powerplant benefits from decades of GE research and development June 5, 2025
- Engine makers emphasizing durability, reliability June 4, 2025
- Boeing CEO: Lessons learned are key to certification of 737-7/10 and 777X June 2, 2025
- Digital twin is a key to JetZero’s hopes for Blended Wing Body entry June 2, 2025
How good is an Airbus A350 freighter?
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By Bjorn Fehrm
Introduction
July 15, 2021, © Leeham News: Airbus is working on a freighter of the A350 to compete with Boeing’s larger freighters, such as the 777F.
The 777F is quite a different aircraft than the 777-200LR, which shares its external dimensions, and the 777-300ER that has donated a lot of the internal structure. So will the A350 freighter be based on the A350-900, as the rumors say, or A350-1000? And how good will it be compared to the 777F?
We use our performance model to find out.
Summary
- The A350-900 is the rumored base for the new Airbus freighter that shall compete with the Boeing 777F.
- Is it the correct assumption? When we look under the hood with our performance model, we see it isn’t.
The Ultrafan Project
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By Vincent Valery
Introduction
June 21, 2021, © Leeham News: Rolls-Royce launched the Ultrafan in 2014, a project to develop next-generation geared turbofan engines. The engine OEM has been working on that project ever since.
The Ultrafan demonstrator started the final assembly this year at the OEM’s Derby facility, with a plan to start and complete ground testing in 2022. Rolls-Royce will await a new OEM program launch to finalize the development to a production engine after 2022.
While using a power gearbox has gathered most of the attention, the Ultrafan uses other new technologies to enable a leap in fuel efficiency. LNA analyzes the technologies used and what lies ahead for the program.
Summary
- An evolving rationale for the Ultrafan business case;
- Much more than the addition of a power gearbox;
- A break with the Trent design
- A significant infrastructure uplift;
- Awaiting the next OEM move.
Bjorn’s Corner: The challenges of hydrogen. Part 31. Wrap-up: Where we stand
By Bjorn Fehrm
April 2, 2021, ©. Leeham News: It’s time to wrap up our series on the hydrogen airliner alternative for Sustainable Commercial Aviation.
We review the status for sustainable aviation as of today, then look at the future next week.
Figure 1. The first certified electric aircraft, the Pipistrel Velis Electro. Source: Pipistrel.
The A350, Part 9: The A350-1000 versus 777-300ER
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By Bjorn Fehrm
Introduction
March 11, 2021, © Leeham News: Last week, we started analyzing the Airbus A350-1000 and compared it with the Boeing 777-300ER.
We now fly the airplanes on a demanding route, close to their maximum range, the LAX to Hong Kong sector. How much better is the 14 years younger A350-1000?
Summary
- The A350-1000 is the logical replacement for a 777-300ER if a same capacity replacement is sought.
- The carbon-fiber structure, a more advanced wing, and newer engines give the A350-1000 convincing arguments for the change.
The A350, Part 5: The A350-900 versus 777-200ER
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By Bjorn Fehrm
Introduction
February 11, 2021, © Leeham News: Last week, we started analyzing the main member of the Airbus A350 family, the A350-900. It’s the design center for the A350 family and has so far 747 orders, of which 354 are delivered.
Over 1,000 Boeing 777 airliners in the market need replacement, and the A350-900 targets about half of these, the 777-200 and -200ER. Delta is one airline that started the switch from 777-200ER to A350-900. How much does Delta stand to gain?
Summary
- The 777-200ER broke the ground for oceanic twin-engine flights. It offered an improved economy on trans-oceanic routes.
- Airliner technology advanced for the 18 years younger A350-900, spurred on by Boeing’s technical leaps with the 787 Dreamliner.
- As the A350-900 employed these gains in the 777-200ER size class, it does to the 777-200ER what it did to Airbus A340-300, it wins the economy race hands down. Read more
The A350, Part 3: The A350-800 versus A330-900
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By Bjorn Fehrm
Introduction
January 28, 2020, © Leeham News: Last week, we analyzed the smallest member of the Airbus A350 family, the A350-800. After Airbus changed the variant to a non-optimal “cut and shut” variant, it was no longer competitive.
Airbus froze the development of the A350-800 and then let it slip out of the program (it’s never officially canceled). The A330neo became the replacement for the A350-800. Was this the right decision? Is the A330neo the better airplane?
Summary
- We saw the A350-800 in its final form had a problem competing with Boeing’s 787. This created a problem for the Airbus widebody program below 300 seats.
- After a thorough investigation, Airbus found a way to update the A330 to take the place of the A350-800. We use our airliner performance model to find out how well the replacement performs.
The A350, Part 2: Analyzing the A350-800
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By Bjorn Fehrm
Introduction
January 21, 2020, © Leeham News: Before the holidays, we started a series to look into Airbus’ A350 family. We analyzed the development program and how the variants have sold.
Initially, the A350-800 won about 180 orders. But as the market received more information about the smaller variant, the more it realized it wasn’t an optimal airplane. It was never officially canceled. But orders was up-gauged to the A350-900. Airbus decided the variant wasn’t competitive and developed the A330neo instead. We now look into why.
Summary
- The A350-800 was positioned as Airbus’ main defense against Boeing’s new 787-9, the most efficient variant of the Dreamliner.
- As the A350 program was delayed, the A350-800 moved from an optimized variant to a “cut and shut” version. This compromised its efficiency.
- Gradually Airbus changed its strategy how to compete with the 787.
Outlook 2021: Turboprops challenged
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By Judson Rollins & Bjorn Fehrm
Introduction
Jan. 11, 2021, © Leeham News: COVID-19 may ultimately prove to be a net positive for turboprop manufacturers. Near-term orders will be pinched just as for jets, but a long-term loss of business travel and the resulting impact to airline yields will make turboprops’ superior unit costs appealing for shorter missions.
Turboprop engines create their thrust with a very high bypass ratio. The result is 30% better fuel economy than a jet. But it also means 30% lower speed. This limits turboprops to stage lengths to about half that of jets.
The market-dominating ATR and De Havilland Canada (DHC) turboprops use this base efficiency to compete against newer regional jets despite having designs which are 20 years older.
ATR-72-600 Source: Wikipedia.
Summary
- Turboprops have attractive economics, making them a larger part of the market post-COVID.
- ATR-72, DHC-8-400 turboprops are old designs.
- The only new turboprops come from Russia (Ilyushin I-114) and China (Xian MA700), limiting their market reach.
- Embraer is keen to enter the market with a new clean-sheet design.
- Continued dominance by ATR, DHC depends on whether Embraer goes ahead.
The A350, Part 1: Intro and A350-800
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By Vincent Valery
Introduction
Dec. 17, 2020, © Leeham News: After running a series on the Dreamliner, LNA will now start a series on Airbus’ latest-generation twin-aisle aircraft, the A350. Airbus should deliver its 400th A350 this month.
After a delayed ramp-up to 10 units per month, Airbus had to cut the A350 production rate to five per month after the COVID-19 pandemic. The European OEM might have to follow Boeing’s footsteps and reduce twin-aisle production rates further.
The A350 program has an official backlog of 532 orders: 415 for the -900 and 117 for -1000. Once passenger traffic recovers, Airbus should ramp production back up of its best-selling twin-aisle aircraft.
Despite its success, the A350 program wasn’t without hiccups. There were several and sizable iterations before Airbus finalized the A350 platform, and the -800 variant is non-existent but not officially canceled.
Summary
- A few iterations before launch;
- Development without significant issues;
- An in-favor aircraft family;
- The aborted A350-800.
The 717 and A220, Part 2: Operational economics comparison
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By Bjorn Fehrm
Introduction
December 10, 2020, © Leeham News: Last week, we introduced the Boeing 717 and its closest replacement size-wise, the Airbus A220-100. Delta, a major 717 customer, is accelerating the replacement of the 717 with the A220-100 under the pressure of the COVID19 pandemic.
We use our performance model to understand why. What are the gains when going from the 717 to an A220-100?
Delta Airlines Boeing 717-2BD landing at LaGuardia. Source: Wikipedia.
Summary
- The 717 version of the DC-9 architecture produced a rugged and well-liked short-haul airliner. It’s five abreast cabin is preferred over the six-abreast Boeing 737 and Airbus A320.
- It’s size-wise in the same 115 seat bracket as the 15 years younger Airbus A220-100. It’s 40 years old airframe architecture holds up well compared to the modern A220.
- The engines of the two are also 15 years apart. But the Rolls-Royce BR715 of the 717 was originally designed to fly on fast business jets, necessitating a low by-pass ratio design. This is a handicap when used on lower speed airliners. It shows against the high bypass ratio Pratt & Whitney PW1500G of the A220.