The aerospace giant has suspended certification flight testing on its new 777X jet.Shares of Boeing (BA -4.20%) were trading more than 4% lower as of 1:45 p.m. ET Tuesday after news broke that the aerospace and defense giant had suspended flight tests of its 777X airplane.Big news out of BoeingAs reported by aviation news service The Air Current, Boeing grounded the test fleet for its latest widebody airplane after routine inspections of one of the jets found that a key mounting component for one of its eng ...