Hop Aero is a stealth-mode aviation and aerospace component manufacturing startup based in Orange County, California. Public directory data identifies Matija Milenovic as co-founder and CEO and Jacob Balaj as co-founder. The company’s described work is still sparse, but it says it is “building a physical internet,” which suggests a logistics or transport infrastructure product rather than a consumer app. I did not find a verified fundraising round or a clearly documented customer list in the available sources.