Loving the ideas of bmi or body fat! Lol would only have to get to the airport six hours early and get checked in by someone trained to measuure body fat? Measure everyone's height and weight?

Maybe make fares by the pound/kilo if Going that way. YYZ-YYT seat sale $.50 pound each way. round trips 100$ for a 100 lb lightweight or 300 for a beefy 300lber and apply a similar rate for all luggage. I like the idea for fairness but logistically looks a nightmare for generally small differences in fares.