I'll be traveling with my 3 month old DD soon and can't quite decide if I should purchase an extra seat for her. From what I've read there are some VERY strong opinions for both buying a seat and for holding in my lap. I realize the main concern is turbulence not crashing. My question is this - would a Baby Bjorn type carrier be a viable option? It won't be a terribly long flight, but I know my DD would be much happier being held. Has anyone tried this? Any advice would be appreciated. Thanks.