first of all dont worry what other passangers will think or say about your baby they dont matter. what i found was helpful was flying durring the day when they would be taking a nap. i flew with my daughter alone she was 8 months old. i left early in the morning (she had to be up at 430a to be on the plane by 630 and get through check in and security). my daughter slept half of our 3 hour flight. as for helpful tips heres a few that i learned and used for myself-
1. its best to buy your baby a seat so they can use their car seat or just so you can have your hands free while they sit and play. (i didnt buy a seat for my daughter our first flight and i was soo thankful that the seats next to me were empty and i let her play in them and she also layed down and slept in it too... our next flight we bought her a seat because it was a 7 1/2 hour flight)
2. only pack what you will need for the flight.(i only took on 2 bags - small diaper bag - 10 diapers small pk of wipes baggies for dirty diapers 2 cups 2 changes of clothes (appropriate for our destination) lots (and i mean LOTS) of dry snacks and lunch for her (liquids i bought after we passed through security) your id and money (so you can pack your purse) a copy of your babies birth certificate and shot records (some airports require the birth certificate).. in the other bag i had things to entertain her will small quiet toys a blanket baby books etc and something for me
3. make sure you bring all needed medications your baby will need durring this flight or trip.
4. i also have my daughter checked out by her dr before we go on a trip just so shes in good health and doesnt have an ear infection or something else.
5. you can check your stroller and car seat (if your not going to use it in flight) at the plane so you can have it available to use when you get off.
6. encourage your baby to suck on a bottle/paci/or nurse as the plane is taking off or landing this will help their ears.
7. did i mention lots of snacks lol
8. i sat my daughter by the window both flights she took and she loved to look out. now since you and your husband are both going and your little on is just 9 months then she can sit in the middle or someones lap to see out.
9. very helpful is to also change your baby before you bored just so you prevent any leaks.
10. i can not say it enough but have your family pre bored and get seated and settled before you have everyone rushing and pushing by you. (this is a lifesaver to do!!!)
other then that just enjoy your trip and i hope this is helpful :)