We're flying to the Caribbean shortly and would like to take a car seat for our 2-year-old to sit in on the plane. We've been lent a Maxi Cosi Tobi seat, which is normally used with standard car seat belts, but I'm having trouble finding out whether it'll work with the plane lap belt. I've checked the BA website and the dimensions are OK, but there's no guidance about the actual fixings. Any advice most welcome!