R.J.
Well... the good news is that almost everywhere else in the world children are EXPECTED to be moving, and vocal, and getting into things (esp in Asia & Africa... but most of Europe expects children to be children as well). So once you're on the ground... you'll be good to go.
You'll have an easier time on the plane when it's not all full of Americans. Although, strangers (from child centric cultures) often start interacting with infants/young children on planes... so be aware of that (the creepy stranger thing = every stranger is pecuilarly American. Most countries all the adults watch out for the neighboring kids. Helping distract a cranky baby, or even offering to hold them, or holding treats their way for them to crawl for... is considered good manners.)
Worst case scenario: She screams all 17 hours. Just repeat the mantra to yourself "Tomorrow! Tomorrow! I love ya, tomorrow! It's ONLY a daaaaaay ah-waaaaaay". Really. It WILL end.
In all reality, it's highly unlikely to be 'worst case'.
The 'drugs' people talk about is usually a combo of benedryl & tylenol. Do a dry run at home. A minority of children get hyper on benedryl, most of the time it knocks them out. But you want to KNOW if your child is one of the ones who gets hyper on it. Both are safe to take for no reason. But on a plane both will ALSO help deal with pain and congestion (hint: ALSO bring along a real decongestant... you can get the infant drops with a lot of difficulty these days, but you can get them. This is just in case she develops a head cold. NOTHING = a screaming baby faster than a ruptured ear drum.) Neither benedryl nor tylenol will keep her asleep for 17 hours.
((There ARE cases of parents -usually stuck in a warzone- who have REAL knockout drugs for their kids. These are life or death scenarios where a noise can give you away. They don't hand these drugs out for plane trips except for children with extreme special needs.))
Another trick is CAR SEATS.
Drive around a lot until she falls asleep in hers. Time your naptimes and drivetimes. Get her used to sleeping in her carseat in the car, and sleeping in a carseat on the plane just isn't that different. HECK. Start putting her in her carseat at BEDTIME (it's just a recliner with a seatbelt... it's a great trick for when they have colds, as well... helps the mucus drain).
Another Trick : DVD player. This is NOT the time to limit screen time. It's 2 days out of her life (there and back). Standard rules do NOT apply.
Another Trick : Earplugs. Buy a gross of them to hand out to nearby seats if she's cranky/fussy.
Another Trick: Walk the aisles. Flight attendants are MORE than happy for you to be walking around when the lights are off if it keeps your toddler happy. You just need to get out of the way of other passengers (and not let her be pestering others), and to sit during cart time. In long distance jets (the big ones) there's usually a smallish section near the tail that is open space. People go there to stretch. You are people. You may go there, too! :D
And really... it may feel like 5million years if she's unhappy the whole flight... but it's ONLY 1 day. You can do a day standing on your head.