Businesstravel Air Internationalpremiumeconomy emission factor trends — Global
Global flight emission factors continue to decline, driven by newer aircraft, growing SAF use, and policies that price carbon or mandate cleaner fuels. The ICCT’s Aviation Vision 2050 (Sept 2025) projects international premium-class warming impacts falling from 0.118 mC in 2025 to 0.089 mC by 2050—a roughly 25% drop in intensity. This is consistent with trends from 2016–2024, where efficiency gains and early SAF uptake lowered emission factors even as demand increased (IATA; IEA; ICAO). Policy frameworks—including CORSIA and national or regional SAF strategies such as the UK Jet Zero Strategy and EU ReFuel Aviation—reinforce this downward pressure. Three main drivers underpin the trend: (1) SAF scale-up supported by mandates and market-based measures, which cut life-cycle emissions for long-haul international aviation; (2) continued fleet modernization and propulsion improvements that reduce fuel burn per passenger-kilometre; and (3) operational and air-traffic efficiency gains that limit avoidable fuel use. Together, these dynamics point to continued, though increasingly policy- and SAF-dependent, reductions in the carbon intensity of international premium air travel.
- Category
- Business travel
- Geography
- Global
- Unit
- kgCO2e / km
- Baseline
- Baseline 2024 → 2050
- Last updated
- Updated
Regions covered: All regions
Projection chart
Cumulative percentage change in the emission factor from the 2024 baseline. Shaded band shows min–max range; bold line is the Viable Pathway mid projection.
Data table (Viable mid projection)
| Year | Min | Viable mid | Max |
|---|---|---|---|
| 2024 | 0.0% | 0.0% | 0.0% |
| 2025 | 0.6% | 0.1% | -1.4% |
| 2026 | 0.2% | -0.6% | -2.8% |
| 2027 | -0.1% | -1.2% | -4.1% |
| 2028 | -0.3% | -1.7% | -5.3% |
| 2029 | -0.6% | -2.3% | -6.5% |
| 2030 | -0.8% | -2.8% | -7.5% |
| 2031 | -1.0% | -3.3% | -8.6% |
| 2032 | -1.2% | -3.9% | -9.5% |
| 2033 | -1.4% | -4.4% | -10.4% |
| 2034 | -1.6% | -4.9% | -11.2% |
| 2035 | -1.9% | -5.3% | -12.0% |
| 2036 | -2.1% | -5.8% | -12.7% |
| 2037 | -2.3% | -6.3% | -13.4% |
| 2038 | -2.5% | -6.8% | -14.0% |
| 2039 | -2.7% | -7.2% | -14.5% |
| 2040 | -3.0% | -7.7% | -15.0% |
| 2041 | -3.2% | -8.1% | -15.4% |
| 2042 | -3.4% | -8.6% | -15.8% |
| 2043 | -3.6% | -9.0% | -16.2% |
| 2044 | -3.9% | -9.4% | -16.5% |
| 2045 | -4.1% | -9.8% | -16.7% |
| 2046 | -4.3% | -10.2% | -16.9% |
| 2047 | -4.5% | -10.6% | -17.0% |
| 2048 | -4.8% | -11.0% | -17.1% |
| 2049 | -5.0% | -11.4% | -17.2% |
| 2050 | -5.2% | -11.8% | -17.2% |
How the Viable mid projection is calculated
Weighted projection based on pedigree quality assessments, normalised to 2024 emission factor
Sources and scenarios
| Scenario | Source | Type | Ambition | Pedigree |
|---|---|---|---|---|
|
DESNZ_Historic
Historic reductions from previous years projected linearly forwards. |
UK Department for Energy Security and Net Zero
From 2016 to 2024, the emission factor has change thus: 0.21939 0.22084 0.22395 0.22151 0.22278 0.225 0.225 0.215419421 0.21542 |
historic | base | 1 |
|
McKinsey_NaturalLimits
One scenario for the future is fuel efficiency gains reducing from 1.5% per year in 2024 down to 0% in 2050. |
McKinsey & Company
According to a McKinsey analysis, carriers reduced their fuel consumption per passenger-kilometer by approximately 39 percent between 2005 and 2019 (pre-COVID-19), a compound annual growth rate of about 3.4 percent per year. The challenge moving forward is that the easy gains have already been captured, and airlines are starting to bump up against the natural limit of some of the improvement levers they used to achieve those gains. One scenario for the future is fuel efficiency gains tapering from 1.5% per year down. This is equivalent to the emission factor dropping from 2024 to 2050 like this: 0.13465 0.132707933 0.130870438 0.129133888 0.127494881 0.125950232 0.12449696 0.123132282 0.1218536 0.120658498 0.119544727 0.118510205 0.117553007 0.11667136 0.115863635 0.115128346 0.114464144 0.113869811 0.113344258 0.112886522 0.112495761 0.112171254 0.111912397 0.111718703 0.111589797 0.111525418 0.111525418 |
forecast | modest | 3.1479973657262184 |
|
ICCT_CurrentCommitments
The ICCT in Sept 2025 set out varying scenarios for the aviation industry. Under the Current Commitments scenario, from 2025 to 2050 the additional millidegrees Celsius (mC) of warming is projected to drop from 0.118 down to 0.107. |
International Council on Clean Transportation
The ICCT in Sept 2025 (Aviation Vision 2050) set out varying scenarios for the aviation industry. Under the Current Commitments scenario, from 2025 to 2050 the additional millidegrees Celsius (mC) of warming is projected to drop from 0.118 down to 0.107. |
forecast | modest | 2.090430209476521 |
|
ICCT_GHGForward
The ICCT in Sept 2025 set out varying scenarios for the aviation industry. Under the GHG Forward scenario, from 2025 to 2050 the additional millidegrees Celsius (mC) of warming is projected to drop from 0.118 down to 0.089. |
International Council on Clean Transportation
The ICCT in Sept 2025 (Aviation Vision 2050) set out varying scenarios for the aviation industry. Under the GHG Forward scenario, from 2025 to 2050 the additional millidegrees Celsius (mC) of warming is projected to drop from 0.118 down to 0.089. |
forecast | ambitious | 2.090430209476521 |
|
ICAO_NetZeroAspiration
The ICAO Net Zero Aspiration is a unrealistic scenario that states what emission factor trends are needed for global net zero by 2050. |
International Civil Aviation Authority
The ICAO aspirational net zero 2050 goal is a commitment by its member states to achieve net-zero carbon emissions from international aviation by 2050. Adopted in October 2022, this goal supports the Paris Agreement's temperature objectives by emphasizing a collective responsibility for climate action within the aviation sector, though it remains non-binding and lacks specific obligations for individual states. This is equivalent of emission factors reducing from index 1 in 2022 to 0.1 in 2050. |
forecast | unrealistic | 3.496960589918261 |
|
ViablePathway_WorstCase
This scenario assumes a 'fossil-fueled development' narrative with rapid growth in fossil fuel use, and no further reductions in flight emission factors. |
Viable Pathway
This scenario assumes a 'fossil-fueled development' narrative with rapid growth in fossil fuel use, and no further reductions in flight emission factors. |
forecast | pessimistic | 3.496960589918261 |
Changelog
- — Updated vpmid mid from blended projection (len=27); appended source1 from UK Department for Energy Security and Net Zero (historic) year=2024, pedigree_score=1.
- — Updated vpmid mid from blended projection (len=27); appended source2 from McKinsey & Company (forecast) year=2022, pedigree_score=3.1479973657262184.
- — Updated vpmid mid from blended projection (len=27); appended source3 from International Council on Clean Transportation (forecast) year=2025, pedigree_score=2.090430209476521.
- — Updated vpmid mid from blended projection (len=27); appended source4 from International Council on Clean Transportation (forecast) year=2025, pedigree_score=2.090430209476521.
- — No update of vpmid mid from unrealistic and unsubstantiated net zero ambition from source5 International Civil Aviation Authority (forecast) year=2022, pedigree_score=3.496960589918261.
Frequently asked questions
What is driving businesstravel air internationalpremiumeconomy decarbonisation in Global?
Global flight emission factors continue to decline, driven by newer aircraft, growing SAF use, and policies that price carbon or mandate cleaner fuels. The ICCT’s Aviation Vision 2050 (Sept 2025) projects international premium-class warming impacts falling from 0.118 mC in 2025 to 0.089 mC by 2050—a roughly 25% drop in intensity. This is consistent with trends from 2016–2024, where efficiency gains and early SAF uptake lowered emission factors even as demand increased (IATA; IEA; ICAO). Policy frameworks—including CORSIA and national or regional SAF strategies such as the UK Jet Zero Strategy and EU ReFuel Aviation—reinforce this downward pressure. Three main drivers underpin the trend: (1) SAF scale-up supported by mandates and market-based measures, which cut life-cycle emissions for long-haul international aviation; (2) continued fleet modernization and propulsion improvements that reduce fuel burn per passenger-kilometre; and (3) operational and air-traffic efficiency gains that limit avoidable fuel use. Together, these dynamics point to continued, though increasingly policy- and SAF-dependent, reductions in the carbon intensity of international premium air travel.
How does Viable Pathway calculate the mid projection?
Weighted projection based on pedigree quality assessments, normalised to 2024 emission factor
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