United’s new 787-9s remain grounded as TCAS antenna issues persist despite Boeing fixes
United’s newest premium-heavy Boeing 787-9 Dreamliner has reportedly been grounded again after Traffic Alert and Collision Avoidance System (TCAS) problems, including antenna-related failures. The aircraft was previously sent back to Boeing, but further TCAS issues were reported. Meanwhile, Air New Zealand says all its 787s are now ungrounded and available without restriction.