Lots of snacks. We went to Disney last week and she slept in the Ergo quite a bit on the plane. She was a lap baby so it was tight. :-) Also, lots of baby wipes - Ry was touching everything and Southwest doesnt have the cleanest of planes.
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Ditto to everything that has been said. Snacks, wipes,toys (some new), and something blanket or travel pillow like to put under your arm or back if your LO falls asleep on you. I flew by myself with Abby from NC to AZ and this saved me from uncomfortable positioning! Sending you happy flying thoughts!
Re: Airplane trip