Bjorn Fehrm

1 week ago | leehamnews.com | Bjorn Fehrm

April 18, 2025, ©. Leeham News: We do a Corner series about the state of developments to improve the emission situation for Air Transport. We try to understand why development has been slow. We examine the non-CO2 effects of Air Transport that contribute to global warming. Over the last weeks, we have looked at contrails, which have the largest impact on global warming, larger than CO2, Figure 1. NOx is a smaller contributor, but it contributes about 20% of the total to Global Warming.

1 week ago | leehamnews.com | Bjorn Fehrm

Subscription requiredBy Bjorn FehrmApril 14, 2025, © Leeham News: The COMAC C919 is finding its first customers outside China. At the same time as COMAC has started work on shorter and longer versions of the C919, work on a widebody C929 has been going on for the last 14 years. If the development of more family members for the single aisle C919 is straightforward, the widebody C929 development has presented several challenges. Figure 1. The C919 COAMC widebody aircraft. Source: COMAC.

2 weeks ago | leehamnews.com | Bjorn Fehrm

April 11, 2025, ©. Leeham News: We do a Corner series about the state of developments to improve the emission situation for Air Transport. We try to understand why development has been slow. We now examine the non-CO2 effects of Air Transport that contribute to global warming. Of these, contrails have the largest impact, Figure 1. In the last Corner, we described encouraging results from airline flight trials with warming contrail avoidance.

3 weeks ago | leehamnews.com | Bjorn Fehrm

April 4, 2025, ©. Leeham News: We do a Corner series about the state of developments to improve the emission situation for Air Transport. We try to understand why development has been slow. We now examine the non-CO2 effects of Air Transport that contribute to global warming. Of these, contrails have the largest impact.

3 weeks ago | leehamnews.com | Bjorn Fehrm

How good is the C919? Part 3. Subscription requiredBy Bjorn FehrmApril 3, 2025, © Leeham News: The COMAC C919 is finding its first customers outside China, which gives us a reason to examine the aircraft. Last week, we estimated its efficiency versus its Western “look-a-like,” the Airbus A320neo. Now, we look at new variants that have been announced and how competitive these would be. Figure 1. The C919 and its variants are analyzed by the Leeham Aircraft Performance and Cost Model, APCM.