We get lots of questions from parents when it comes to air travel and child restraints.
Delicious Baby (http://www.deliciousbaby.com/journal/2009/feb/19/reader-questions-keeping-active-child-calm-plane/) just posted an interesting Reader question regarding her frustration with both using her Car Seat inflight and the Cares Harness.
Still not sure what would work best for you? Check out the reviews on Amazon http://www.amazon.com/CARES-Child-Aviation-Restraint-System/product-reviews/B0012E4FV8.
I’m still a fan of the GoGo Kidz Travelmate! http://www.weetravel.ca/products/descriptions/carseats/travelmate.shtml