When looking at repurposing assets for aviation, there are several opportunities available, albeit paired with the general challenges of actualising a hydrogen economy (cost of production, regulatory use, etc). SAF are predicted to consume 75 billion litres by 2040, so the use of biofuels looks to become more prominent. Integrity and aviation engineers, however, can look forward to managing their assets with minimal changes to the design and operational life with biofuels, while maintaining the largely same risk management with the previously mentioned kerosene. As it stands, only five airports have regular biofuel distribution today (Bergen, Brisbane, Los Angeles, Oslo, and Stockholm), with others offering occasional supply. But the centralised nature of aviation fuelling, where less than 5% of all airports handle 90% of international flights, means SAF availability at a small number of airports could cover a large share of demand, which saves potential costs on new technology and improves safety/integrity (by targeting existing resources).