I have a Britax Pavilion and I'm wondering if I should purchase another, more lightweight car seat for my son for air travel; and if so, which one? We average about 12-16 flights per year. I'll be traveling alone with him in a few weeks and, while I can do it, I'd rather not lug the Pavilion through the plane while managing my 2yo. Also, does anyone have experience with the Gogo Baby Travelmate, Travelmate Deluxe or Britax Travel cart? I'm trying to decide which one would be best to use when hauling the seat through the airport and onto the airplane. Thank you for any input, it's really appreciated!