I've done many interstate & even an international flight with Matilda. I have to say the younger the better!! Okay maybe not sleep wise...

With the plane thing, yep definately boob it on take off & landing. They may say to you that you can't, but you can Usually the descent is the worst, so the 20 minutes prior to landing with their ears. I always brought dummys too. 6 month olds generally are quite content to have 2-3 toys & wander up & down the isles if possible.

Settling...all I can say is do your best to keep everything as you would at home. Are you staying with friends? In a hotel? Family? A great idea is to bring familiar bedding, so we bring Matilda's pillowcase (she's older now) but when she was younger we'd bring her flat cot sheet & her cd & her wrap/blankie. So she's have familiar things when she woke up so as not to be scared. She would wake up more on holidays but I guess if you expect that then it isn't so traumatic.

We always share the same room with her & she generally will co-sleep on holidays where as at home she won't. So just try to make it as similar to home as possible & remember waking up in a strange place can be scary! When we went to America, we went out one night & came home & Matilda was in bed with my Mum!! In another room... it was hilarious, apparently she just walked into my mum's room & climbed into bed with her.