Khloe Kardashian was on an American Airlines flight from Los Angeles to New York City on Tuesday afternoon, but there was a mechanical problem with the plane and it was forced to make an emergency landing in Las Vegas. Yikes!

A source on the flight tells X17online exclusively, "There was a burning smell in the first-class cabin and passengers started panicking, and that's when the pilot made the decision to land in Nevada. It had something to do with the A/C -- it definitely smelled like there was a fire."

The reality start Tweeted to let fans know she was okay: "Supposed 2b in NYC but somehow I'm in Vegas NYC I'm trying to get there. Emergency landing but Joyce [Bonelli] and I are safe."

Khloe is currently stuck in Las Vegas, but she's scheduled to appear on Good Morning America tomorrow morning to promote her new show, Kocktails with Khloe, so here's to hoping she makes it! Live Schreiber was on the flight too so more than one Hollywood start's schedule is disrupted!

We caught up with Khloe taking off at LAX just hours ago ...