Flying with newborn.

Martinezx4 • 24, wife, mother, expecting #2, excited!
So we will be relocating in January to Hawaii due to orders. Our toddler will be 4 but our baby will be 3 months old. So of course we will have to fly. Is it safe for the baby? What advice or stories do you have if you've traveled with a baby before? Help. Thank u for all responses.