Sorry I'm sure this has been done a million times before...
My parents have very generously paid for us to go to Florida with them when our DD will be 23 months. It's been booked for over a year and at the time seemed a great idea but DD has started having quite big tantrums and never sits still for a minute (just a normal toddler really!) and I'm veering between excitement and wondering what on earth possessed us!
It will be her first ever flight and she doesn't have her own seat (as it was going to be an extra £600) so will be on my lap.
Your best tips please?! 
I think I've got the usual stuff covered - various toys, stickers, colouring books - you name it, snacks etc.
Fave programmes on the tablet.....
What other things worked well for you, any little games to play or tips on avoiding problems etc?
I'm so panicky about her not sitting still on take off and landing / going into a huge tantrum etc. (am really not a good flier as it is - arggh! )