Boeing pauses tests of 777X aircraft after finding damage to one of the jets structures CNBCBoeing grounds 777X test fleet after failure of key engine mounting structure The Air CurrentBoeing Finds Cracks in Structure of 777X Test Jets The Wall Street JournalBoeing Halts 777X Flight Tests Over Damage Found in Engine Mount BloombergBoeing grounds 777X test fleet on failure of engine mounting structure, says report Yahoo Finance