The two you are referring to are:
Ride Safer Travel Vest:
[ame="http://www.amazon.com/RideSafer-Car-Seat-Travel-Vest/dp/B000KCV61U"]Amazon.com: RideSafer Car Seat Travel Vest - Size Small 30 - 60 lb and 34 - 52 Inches - Blue: Baby[/ame]
Safeguard Go/Safety First Go.
http://www.safety1st.com/usa/eng/Pr...ails/2384-22256AHE-Go-Hybrid-Booster-Car-Seat
In addition to this, I would add:
The Radian, because of its ability to fold, which is convenient for older harnessed children that can sit using a lap belt or CARES harness.
This seat will fit folded in the overhead bin of a standard jet, not a regional jet.
The Scenera: Lightweight convertible and fits well in some umbrella strollers for transport
The Maestro : lighter weight seat for older harnessed kids, can use the tray table when installed on the plane. Does not rear-face.
CARES HARNESS: Alternative to using your seat on the plane.
http://www.kidsflysafe.com/
Some seats are NOT approved for airline travel, mainly due to size. Always look for a sticker on the side of your seat.