Unsolved: United Airlines grounds new premium Boeing 787-9 again after suffering TCAS issues

The aircraft is facing yet another setback stemming from persistent TCAS issues.
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United Airlines' 'cursed' Boeing 787-9 grounded again by TCAS failure after returning from Boeing repairs

A United Airlines Boeing 787-9 Dreamliner featuring the new 'Elevated' interiors — including Polaris Business Class suites ...