Or they could strap the body into a jump seat for the cabin crew and a lovely stewardess could take the dead lady’s seat.
Or move the passengers to the apparently empty seats in first class.
Or stuck the body in a bathroom and closed that bathroom.
There are lots of better ways than this.
Shut up and enjoy the companionship of the corpse!
Retired airline captain here: So, it took 90 - 90! - posts before someone suggested putting her in a lav? After all there are 4-5 of them on larger aircraft.
And, since I’m now in my 16th year a volunteer law enforcement chaplain I can assure you that decomposition begins to occur quickly after death. The smell is unmistakable - ask any cop, fireman or EMT. If seated in a lavatory it would be vented overboard.