We're taking Ds on a long haul flight with Virgin when he's almost 2. We can prebook our seats and I've just seen that there's an upstairs section of the plane of about 8 economy rows and 6 premium economy rows. WIBU to prebook these seats with a 2yr old? Or is this a genius idea to keep him out of the way and with a bit more room to sit in the floor and spread out?