Got an extra carseat? Travel tips?

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Aggieoj asked me to post for her--she's looking for anyone with an extra carseat for her to travel with this weekend. She's got a padded bag for it and would only be using it between the airport and hotel.

She's thinking of taking her DD to where her DH is on a 2-wk business trip. First time flying alone with kiddo (who is 1.5). Any tips for her on how to make it as easy as possible?