During my most recent trip to Europe, I had the opportunity to use the most exclusive cabins in Delta, the Delta One Cabin. It was a great experience, starting at the airport. We left from the Raleigh-Durham (RDU) airport to Paris Charles de Gaulle (CDG). As part of the benefits of a Delta One passenger, you will be considered "Sky Priority" which means that you will have an accelerated checked in at the airport. Also, you will have access to the Delta Sky Club, while you wait for your flight to be ready for you to board. In the Delta Sky Club, you will find drinks (alcoholic and non-alcoholic) and variety of food, no extra charge. Also, Delta staff is dedicated in the Delta Sky Club to answer any question that you may have or they may direct you to your flight when it is ready for you to board.
In addition, as a Delta One passenger, you will be the first group to board the plane, and your bags will be the first ones to be handled.
Once you enter the plane, you will find one of two styles of seats, depending on the aircraft. I was able to see at least two (2) different models of Delta One Suites. Both of them included the following items: a bag with a down-alternative pillow and a blanket, a pair of slippers, headsets, and an amenity kit. The amenity kit included a tooth brush, a lip balm, a pen, a hand cream, ear plugs, and a sleep mask. The pillow provided is medium sized and the blanket is large, very cozy, and warm.
When we talk about service, think about a service that goes above and beyond. As soon as you settle in, before the flight departs, you will be offered a drink. For me, this is my mimosa time. Shortly after the aircraft is in the air, you will be served some snacks, your selection for main meal, and dessert. During my flight, as starters, I had tomato bisque, bread and strawberry salad. For dinner, braised beef short ribs, mashed potatoes and green beans. For dessert, I had an Ice Cream Sundae. In the morning, I was offered a nice hot cup of coffee, french toast, and a fruit salad.
Another good feature of Delta One is the space. Not only the seat is very spacious but the leg rooms is huge! Of course is required because the seat flats 180 degrees so you can have a well rested flight and most importantly you can stretch! I will like to mention, that the seat also serves as a recliner. So, if you don't want to lay completely flat you can recline it, raise your legs, and watch three movies like I did on my way back to the US. If you like to watch movies during your flight, you may enjoy a larger monitor depend on your aircraft.
In summary, if your budget allows it, investing in Delta One is worth it for the applicable International flights and/or the selected domestic markets in which Delta One is available. Per my experience, I can say that I barely felt my almost 8 hour flight to Paris. It went super fast, I was able to rest, have my privacy, and enjoy my flight at maximum.