We're taking a trip in a month to visit my parents in Louisiana. I made this trip by plane in October, when ds was a little more than 2 months old, and I just had him in my sling and on my lap for the 2-hour flight. Well, he'll be 9 months this time around. I didn't reserve a seat for him, for a carseat, because I recalled the last time being so easy, and I figured I could just fly with him on my lap again. I'll have DH with me, so the squirming and curiosity will at least have two watchdogs. But am I making a big mistake in not getting him his own seat? I have time to correct the oversight, if it is one. Any thoughts?