Adding on to what Green Eggs is saying, Emirates includes transport to the airport and also to your hotel on the arriving end with business class. There is also a whole departure area dedicated to checking in and relaxing before the flight in the Dubai airport. Little perks like that help. I don't think American carriers have anything like that, but the Middle East really gives you the royal treatment if you fly business or first class. I flew first class on an
A380 and I remember the flights more than the destination! Being able to have a shower before you land is a nice experience! I would've stayed on that flight twice as long happily, and I felt great when I got to my hotel - ready to go! I think the ticket cost $20k if you buy one outright, so I guess that's still a little rich for my blood, but it's a wonderful experience to do it once (or twice)... It's amazing the people you meet at the bar too.
Casey Neistat did a video on it -
https://www.youtube.com/watch?v=84WIaK3bl_s but it really doesn't do the experience justice. For example, the food and service is incredible. After my shower, I used the plush Emirates bathrobe to chill out for a bit, the bathroom was huge! Yeah, I'd definitely like to do that again.
Charter jets are another ridiculous luxury. The biggest plus there is a dedicated departure lounge and ability to schedule your flight. I have flown on helicopters out of these airports for business, but not flown on a charter, but I'm not as eager for that experience, other than to say I've done it at some point.