Jet Parts Engineering turned the unglamorous bottlenecks of airline maintenance into a global aftermarket platform. Its playbook is simple to describe and difficult to execute: find the part an operator cannot get, engineer an FAA-approved alternative, keep it on the shelf, and answer the phone.

Zymbly is a UK-based AI startup that builds voice-first copilots for aircraft maintenance technicians - automating troubleshooting, parts lookup, and compliance documentation so mechanics can spend their time fixing planes instead of drowning in paperwork. Backed by Y Combinator (W26) and built by a team with deep roots in aviation and enterprise AI, Zymbly targets an industry facing a global shortage of 43,000 technicians and a maintenance capacity crisis.