Flying with kids can be a nightmare, but some airlines make it less stressful by being family-friendly (or at least more family-friendly than the other carriers). Here's a chart from Fatherly comparing airlines' features.
Feeding Skills Timeline- I would add that some of these suggestions are off as far as timing goes. It's recommended to not give babies peanut butter until at least a year old, but always consult your pediatrician. * the psychology of baby feeding!