Hello,
I have a lot of experience traveling on international flights with 2 kids, with and without my husband so I hope I an help. First of all, depending on the airline and your destination, you may be required to have documents that allow your children to fly with you, if your husband is not going with you. Your airlines and travel agent should be able to help with that legal stuff. For the help that we moms always need when traveling, I have found that my 6 year old boy does so well with a gameboy or portable dvd player, or something of the sort that will keep his mind on fun things. One flight I was on actually had electronic devices for each seat where kids could watch movies, cartoons, and even play games. So me lugging around the portable dvd player, dvds, and games was a pain, but that's ok because the next flight did not have the same luxuries. My daughter is 2 and I find it is harder to keep her occupied during long flights and it's just easier when my son is really into his fun stuff. I have found that if I keep my daughter awake as long as possible before we get on the flight and try to get her sleepy so that by the time it's time to take off, she is ready for sleepy time. Keeping thier ears clear is very hard too, but I make sure that when we are taking off or landing, the baby has a bottle or binkie to suck on and my son is chewing on gum. I think the most important thing is to be prepared. Know what will keep your kids entertained and helping the baby sleep helps, incase your baby is not as good a traveler as some. I hope this helps.
S.