YWIW? Another reason why I think that you are on solid ground .... eeerrr the kind of solid ground that exists at FL 390 .... is that musicians buy extra seats for thei instruments. Precious guitars belonging to classical soloists and so forth, have been known to be strapped in to biz and 1st seats.
Others who do not want to be disturbed, buy a second seat to block the one next to them (again only in biz and 1st). I'd like to see c/c tell these folk to shift!
From my point of view, I would consider buying an extra seat for a child - as long as it was on a different plane to the one that I am travelling in.
