Sustainable Energy Sources in Aviation

Aviation is highly dependent on fossil-based jet fuel, which contributes about 2–3% of global CO₂ emissions (and more when non-CO₂ effects like contrails are considered). To decarbonize, the industry is adopting a mix of sustainable energy pathways:

Sustainable Aviation Fuels (SAF)

What it is: SAF is produced from non-fossil sources (e.g., waste oils, biomass, or even synthetic/e-fuels).

Benefits: SAF can reduce lifecycle CO₂ emissions by up to 80% compared to conventional jet fuel, depending on the feedstock and production method.

Compatibility: SAF can be blended with Jet A-1 and used in current aircraft without modifications.

Challenge: Limited availability and high cost. Global SAF production is less than 1% of total jet fuel demand today, but mandates and incentives (EU Fit for 55, U.S. SAF Grand Challenge) are scaling it up.

Hydrogen Power

What it is: Hydrogen can be used either in fuel cells (producing electricity) or burned directly in modified gas turbines.

Benefits: When produced with renewable energy, hydrogen is nearly zero-carbon.

Challenges: Requires new aircraft designs, storage at very low temperatures (cryogenic), and new airport refueling infrastructure. Likely to enter commercial aviation at regional or short-haul scale around the 2030s.

Hybrid & Electric Propulsion

What it is: Electric or hybrid-electric aircraft use batteries or a mix of batteries + conventional fuel/hydrogen.

Benefits: Ideal for short-haul flights, regional air mobility, or urban air taxis. Zero direct emissions if powered by renewables.

Challenges: Battery energy density is a limiting factor for medium/long-haul flights.

Role of Flight Planning Services in This Transition

Flight planning is no longer just about shortest route or lowest cost — it’s becoming a decarbonization tool. Services now help operators integrate sustainable fuels and energy options into operations:

SAF Integration

Flight planning systems can track where SAF is available (airports, suppliers) and plan fuel uplift strategies accordingly.

They help with Mass & Balance calculations, since SAF can differ in density.

Crucially, they provide MRV (Monitoring, Reporting, Verification) data for regulators (e.g., EU ETS, CORSIA) to prove SAF usage and claim emissions reductions.

Compliance & Reporting

Airlines are under growing regulatory pressure (EU ReFuelEU, ICAO’s CORSIA). Flight planning systems provide the digital infrastructure to:

Track SAF blend percentages.
Generate sustainability compliance reports.
Forecast fuel and emissions savings across fleets.

Optimized Routes for Emission Reduction

Advanced planning tools can minimize fuel burn and avoid contrail-forming regions, cutting both CO₂ and non-CO₂ climate impacts.

Algorithms weigh time, cost, fuel consumption, and now environmental impact — offering airlines "eco-favorable" routing options.

Preparing for Hydrogen/Electric Aircraft

As hydrogen/electric aircraft emerge, flight planning will adapt to:

Different range/endurance profiles.
Infrastructure constraints (only certain airports offering H₂/e-charging).
New safety and operational parameters (e.g., emergency diversions with hydrogen).