No we flew United. We put the seat at the Window and I sat in the middle and my husband on the aisle. We were fine with the space. This was also I think before United changed to their new slimline seats. I think SW seats are a bit bigger but I could be wrong

And I forgot to mention that my daughter was also on the small side. She was a premie, so I get the concern. She could still fit in that seat at 5 1/2 but we moved her up since her brother needed it and she was coming close to the height max.

I say pull the trigger but my experience may not be what others have done.

Thanks. I think I'll likely pull the trigger on the roundabout and Britax travel cart.

Gave in, and spent more than I wanted. Went with the Britax marathon clicktight with the Britax travel cart.

We have a marathon also. Good choice.

Bigger than I thought it would be, but I like the clicktight system.

Will post a pic of the seat and cart later. They work together wonderfully!