Newborns are super easy on a plane. If your planning on wearing her, make sure you take her out of the carrier you're wearing. That almost caused a scene when we traveled with my daughter. And nurse her as much as you can, if you're nursing. Or give a paci. The sucking will help so her ears dont get bothered by the air pressure change.

Snacks, snacks, and more snacks. You can take any snacks that aren't liquid with you. For the newborn, baby wearing will be a life saver thru the airports. Nurse or a bottle during take off to prevent ear popping.