Is it allowed to temporarily switch seats between classes?
My sister, her son and I will be flying on the same plane from LAX to SYD (A380). I'll be in 1st, and they'll be in economy. Since this is a very long flight (16 hours), I was thinking I'd give my sister a break for a few hours and I'd sit with my nephew, while she takes my seat in 1st. How possible is that on Qantas?