I'm going to be a stiff and recommend not going to the USA, for the soul purpose of not financing Trump's America First policies. Also reduces the likelihood that you and your family will get shot, and increase your life expectancy. Honduras is falling apart right now. Might be cheap to travel there.
In regards to travelling with kids, those portable playpens are amazing. They pack up very well and are incredibly travel friendly. Some hotels offer them, but... Just like there might be reproductive juices all over the hotel room, there might be barf, poop and pee all over those playpens. But whatever.
http://www.toysrus.ca/product/index.jsp?productId=121116776You can always borrow ours. I can guarantee there's barf, poop and pee, but at least you know where it came from.
Gate checking strollers is easy, so I'd recommend that. If you're going to a place that has lots of escalators and stairs, a carrier back pack would be better.
Claim your baby food. Even if you brought it from Canada, as soon as it leaves the country, the meat (or maybe the food entirely) becomes a product of the country you're returning from. Customs took our baby food because we didn't claim it when we returned to the country
Bring lots of new toys and items for the plane rides. Sticker books are effective. Those reusable sticker books are cool. Things that make lights are good too.
These don't need to be lavish. Dollar store these items. Don't show baby all of them at once. Just pull them out one at a time as she gets bored of them. Try to avoid the noisy ones for your fellow passengers, but at the same time, screw them. It's noisy toys or crying baby. They can take their pick.