We ate lunch at United Airlines' secret invitation-only restaurant and it takes airport food to a whole new level

In late August, United Airlines opened Classified, the hottest restaurant to hit the airport dining scene in recent memory.

But apart from those dedicated to restaurants and airport dining, few know of its existence and even fewer will have the privilege to dine at the establishment.

And don't bother exploring the confines of Newark Liberty International Airport's Terminal C looking for Classified. Your journey will end in futility.

That's because Classified is invitation only and only a select group of United's most elite passengers will find their names on the vaunted list.

United and their partner in this endeavor, OTG, have been pretty tight-lipped about who is worthy of an invite. However, being a member of the airline's elite 1k club - those who fly 100,000 miles a year on United - certainly wouldn't hurt your chances.

To be able to dine at Classified, United passengers must first receive an email from the airline inviting them to make a reservation. Then, the passenger is made aware of the restaurant's location along with instructions for how to properly approach the host to gain access to Classified.

Classified is but a small portion of a $120 million revamp of Terminal C's travel experience that will see the launch of as many as 55 stores and dining establishments by the end of the year. United's Terminal C is run in partnership with OTG, a company that designs and operates restaurants such as Classified.

A few days ago, Business Insider got an exclusive behind the scenes tour and a chance to experience Classified.

Here's a closer look at our experience.