Ditto Diane C.
Also, as far as the arm rest goes, it is only ok to do that if you are sitting with your children, family, etc. and it does give a tad more space.
As a family we raise them but before you make assumptions and raise it between you and stranger, please ask the stranger.... I was quiet annoyed once when someone took it upon themselves to raise it between her and myself just so she could be more comfortable and not be required to pay extra fees. I would have been happy to have complied with her and allow the arm rest to remain up for her comfort if she had only asked me nicely vs attempting to bulldoze me.
Just make sure you know all the facts Ahead of time which will save you extra time, possibly $ and keep your trip more relaxing.
Enjoy your trip!