Surf Air Mobility is trading 5.32% up at $0.81 in pre-market after naming Barrett Brown SurfOS president; this appears to be the main company-specific catalyst. - Announced at 6:30 a.m. on September 23, 2026, Brown will lead go-to-market strategy and commercial expansion for the Palantir-powered, AI-enabled SurfOS platform, with the company targeting stronger revenue growth and customer adoption. - Momentum follows SurfOS’s first OperatorOS customer agreement and airline-sector strength; no earnings release or major financial guidance update was identified that day.