<human>: Can you give me a shortened version of the text?

Ok, first, a little backstory.  I have been with my boyfriend for almost 2 years now.  He is the farther of a 3 year old that I can honestly say I love like she is my own.  I have no kids of my own, and he is the first person I've been with that has had a kid/kids.  About 6 months ago, we had to move away for several different reasons.  It was heart breaking for me, so I can't even begin to describe how he felt, but we both decided that it was what needed to be done to better our lives, and in turn, better his daughter's life.  He and the mother of his child have had a very rocky relationship, but she has finally decided to put that behind them and do what's best for the child.  So, we get to see this week for the first time in 6 months!  Now comes my predicament.

Because of his work schedule, I will be going to pick his daughter up.  Lately, she has been throwing fits over the smallest things, such as not getting to eat a piece of candy or not being able to watch a movie right then and there. (When we lived there, she was an absolutely angel.  Please and thank-yous were common, she rarely did anything that deserved a time out.)  When we come back, it will be her first time ever on a plane.  Basically, I'm worried about her attitude change, combined with being in a very unfamiliar situation, leading to a very bad plane ride for both us.  Does r/Parenting have any tips or tricks to make this a little easier on her, and as a result, me?

Thanks in advance!
<bot>: Step mother (for all intents and purposes) is taking a 3 year old who has been prone to temper tantrums lately on her first plane ride.  Need tips/tricks/advice.