Re: Flying with 18 month old?
Even if you don't want your child to play on an iPad, it would come in really handy for you to read Kindle books to your daughter. There are always free ones at Amazon.
Also one of my recent real favorites for my toddlers has just been reduced from $2.99 to 99c - it's called "Where Is Silly Bear?". My kids love it and ask for it quite often because of the cute pictures and fun rhyme.
A plane trip is the perfect time to read kindle books to kids.