Boeing warned plane owners in 2011 about a broken part that contributed to a UPS plane crash that killed 15 last year but at that point the plane manufacturer didn’t believe it threatened safety, the ...

An aircraft that crashed in flames in Kentucky in November had a structural flaw that had been identified by Boeing on similar planes 15 years ago, according to investigators.

The service letter noted four previous failures of a support structure that helps secure the plane’s engines to the wings.