The go isn't the right choice for you...need the
top tether.
Have you considered getting a luggage trolley from Wal-mart---that way you don't have to carry it...or will it wedge into your stroller...so at least you can wheel it between gates.
I think one of the gogo kidz fits many seats---just not
britax...I'm just not sure if it'll fit the bolero.
Susan