Last month, in October, United Airlines was not only facing the government shutdown, but it also saw a couple of flights make emergency landings. Among them was flight UA1357, which was diverted and returned to Washington due to a technical issue . We also saw flight UA1093 from Denver to Los Angeles diverted to Salt Lake City due to what was initially deemed space debris (it wasn't).

Now, United is back on track, especially with its flight schedule, following the end of the government shutdown.

However, an incident has occurred. This morning, a domestic U.S. flight from Dallas to Chicago was diverted to St. Louis over a very serious threat.

Here's a closer look at why the flight made an emergency landing and what happened once the passengers were evacuated. United Airlines has issu

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