Guys. Scale does not work linear to weight.
PA28 OEW is 765kg = 191.25kg/seat
Saab340 OEW is 8140kg = 246.67kg/seat
A320 - 42600kg @ 144pax = 296kg/seat
B777-300ER - 167800kg @ EK's 357pax = 470kg/seat
A380-800 - 276800kg @ 495pax = 559kg/pax
But best of all - my 1984 Atlas16 hangglider was 26kg/seat!