Right now, $250 each probably is a good price. Oil went up, so tickets go up. They seem to be pretty high lately, unfortunately. Â Try cheaptickets.com or kayak.com and see if you can get anything better. You can always try priceline.com as well, but that one can be a bit iffy with having to accept whatever time/airline they choose for you. If you truly are very flexible with dates etc it might work out well.
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You can take your car seat on the flight with you, which actually works out pretty easy if you're taking it with you to drive around at your destination anyway. Â I would imagine that in Ethiopia you'll be taking taxis and not using the car seat, so in that case you'll have to think about whether you would want it there or if it would just get in the way. I think you might get one of those wheeled boards for the car seat to attach to and that way it can actually be easier in the airport. Â If you take the car seat, however, your DD will have to be in it the entire flight. There will be nowhere else for her to go.. whereas without it you could put the arm up between your seats and stretch the two of you over both seats with her on your lap, or she could sleep with her head on your lap and her feet on your partner's lap (assuming you have seats together. Â Also, will you be coming home with another child from Ethiopia? In that case, would you then need/have two car seats? I would definitely suggest the wheeled board or skipping it altogether if that's the case. Â
As for the airline harness, if I remember correctly most of them actually aren't allowed by the airlines during take off and landing. Your child has to either be in a car seat or belted using only the seat's own belt at those times. If your child is the type to want to run around and you want a way to get her to stay in her seat, either the car seat or harness might be a good idea.. but if she'll sit and play with toys you might not need either.
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Oh, and another thought. Friends told us that when you travel internationally you can pick your seat for your flight 24 hours ahead of the flight. If you get in right at the moment when people can start choosing seats you can possibly get the seats that are right behind first class. These usually have more foot room (though less space for stuff since there isn't under the seat in front of you). When they took their 2yo twins to Israel they let one of them sleep on the floor in front of those seats on a blanket. She slept 10 hours!