Investigators ​will miss ​Friday's one-year deadline to ​explain why an Air India jet crashed because ‌an ⁠examination ⁠of the ​Boeing plane's engines in the U.S. ​still needs to be completed, Bloomberg ​News reported ⁠on Thursday, citing ‌people ​familiar ​with the ⁠matter.India's Aircraft Accident Investigation Bureau will likely issue a status report this week focused on the reasons behind the ‌delay, and a final report is then expected ⁠within three months, the report added.Reuters could not immediately ​verify the report.