source:[1] Vertical Aerospace (EVTL): Evaluating Valuation After VX4 eVTOL Prototype Achieves Phase 3 Flight Test Milestone (https://finance.yahoo.com/news/vertical-aeros ...)[2] Vertical Aerospace secures production facilities, reaffirms 2028 certification target (https://vertexaisearch.cloud.google.com/groun ...)[3] Vertical Aerospace Announces Manufacturing Facilities and Updates on Path to Certification During Capital Markets Day - Business Wire (https://vertexaisearch.cloud.google.com/groun ...)