In the not-so-distant future, aviation could see a groundbreaking transformation with the introduction of e-fuel, a third-generation sustainable aviation fuel. E-fuel, also known as 'power to liquid' fuel, involves converting carbon dioxide and hydrogen into jet fuel, offering a net-zero emission solution. The process, although relatively straightforward scientifically, poses a significant challenge in terms of cost. E-fuels are currently priced at $8,720 per ton, making them considerably more expensive than bio-based SAF and conventional jet fuel. The industry is striving to scale up e-fuel production to commercial levels, facing obstacles such as high plant costs and a scarcity of the required hydrogen type. Despite these challenges, the potential benefits of e-fuel are immense, with the ability to produce jet fuel without feedstock limitations and land-use concerns associated with bio-feed SAF. Political support and investments are deemed crucial in overcoming the cost challenges and scaling up e-fuel production. Several carriers have already started exploring alternative fuels, with some operating flights using bio-based sustainable aviation fuel. The future of aviation may indeed rely on innovative solutions like e-fuel, signaling a positive shift towards a more sustainable and environmentally friendly air travel sector.