Hi Ali,
Yes, I flew from New Mexico to visit family in Yorkshire. When we chose a flight we tried to pick one with the least time of layovers. Still, it was a 23 hour day. That was way long for me! We also chose an overnight flight so I could sleep the majority of the hours. Not being able to move about the plane was very difficult for me. My body hurts extremely bad when in one position too long. I did tell my doctor and was given sleeping aid to help with the flight. Lay overs and customs were trying to say the least. Sleep as much as you can, and move about, because limited space and lack of movement have an effect circulation. Try to keep a positive attitude, because stress also has an effect. You are young and I'm sure you will do well, with the proper planning. Which you have already begun! Vegas will be so much fun for you. Take plenty of Pictures, and enjoy sweetie! Love Di