The single most important piece of advice travellers, who will be on a plane for ten or more hours at a time, should take is that you need to be comfortable.
Air India flight attendants stand at the base of stairs during the unveiling of Air India's first Boeing 787 Dreamliner. HT/Sanjeev Verma
Choose Your Seat Wisely. Whenever possible, buy a ticket in a premium cabin (first, business, or premium economy) or carefully select your coach seat, according to Huffington Post.
You'll be stuck on the plane for a long time, so you don't want to be confined in a middle seat. If you're the type who likes to get up and walk around, snag an aisle.
Study the seat maps at your airline's website and be sure to check out the advice offered at SeatGuru and SeatExpert.
Bulkhead seats--the ones with a wall in front of you instead of another row of seats--can sometimes be a good bet, but are often reserved for families.
Exit rows also provide extra legroom but the armrests are often immovable and that can be a drag. Consult your plane's configuration before selecting a seat.
Remember that seats that were previously blocked for selection by elite flyers will open up 24 hours before check-in.
If you were originally assigned a less than ideal seat, check for new options at the 24-hour mark or with the agent at the airport.
Wear Comfortable Clothes. If you're flying long distances, you'll be on the plane for several meals and at least one sleep cycle.
Wear comfortable, loose-fitting clothing or bring pajamas and change into them before you settle in for a nap.
Also bring a toothbrush, toothpaste, hairbrush, and change of underwear. You'll definitely want to freshen up before landing.
The airline will provide you with a blanket, but you may also want to bring a lightweight sweater in case the cabin is cold. This is especially true if you're seated in an exit row, which can get chilly.
Dress in layers so you can adjust to the cabin temperature.
Block out the world. Carry earplugs, noise-cancelling headphones, and an eye mask.
This way you can effectively block out the chatter and lights around you.
If you are a smoker, the mere thought of a long-haul flight on which you can't light up probably makes you feel pretty agitated.
Talk with your doctor about ways to handle the trip. You may need the assistance of a nicotine patch, nicotine gum, or even electronic cigarettes.
Try to remain healthy throughout the flight.
Airplane cabins are incredibly dry, so drink beverages, preferably water, throughout the flight.
It doesn't hurt to apply moisturizing lotion to your hands and face.
You won't be able to do a full cardio routine in the aisle, but you absolutely must get out of your seat every hour or so to walk around.
While seated, you can do simple leg and arm lifts to keep your blood circulating.
Plan your sleep. If you're flying 15 to 18 hours, you really should try to get some sleep.
Decide if you want to sleep when your body decides it?s time or if you're going to try and get on the time schedule of your destination.
Prepare for the long flight and be sure your carry-on is loaded with your laptop, tablet or e-reader, books and magazines or MP3 player.
Today's long-haul airplanes offer plenty to keep you occupied from a bar/lounge to WiFi and inflight entertainment options that range from first-run movies to television shows and a slew of music channels.
Your seat will also have a power port so fire up your laptop and get some work done, if you're so inclined.
The most important tip for your next long-haul flight is patience.
Mentally prepare yourself. It's going to be a long flight.
Accept it and enjoy being relatively unplugged for the next few hours.
Get some rest. Talk with your travel companions. Enjoy the journey as well as the destination.