Unsolved: United Airlines Grounds New Premium Boeing 787-9 Again After Suffering TCAS Issues

United Airlines’ newest Boeing 787-9 has been unable to catch a break, as just days after it returned from Moses Lake, it seems to be grounded again, and its trans-Atlantic service from London Heathrow Airport (LHR) to San Francisco International Airport (SFO) was canceled this evening. The problem, as reported by aviation insider JonNYC on X, appears due to challenges with the Traffic Alert and Collision Avoidance System (TCAS).

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