flying with baby

C
So I'm going on a week long trip to visit my best friend. She is a 5 hour flight away and baby will be just about 7 months when we go. There is a 3 hour time difference as well. 
I'm looking for any and all travel tips: air travel tips- stroller? Carrier? Best times of day to fly? What to do about  small jet lag? 
Thanks ladies!