Passengers should be charged by weight of luggage and passenger combined.  Why should a 110 lb woman pay the same fair as a 250 lb man?  A lightweight traveller who packs light is much cheaper to transport than an overweight traveller who likes to take everything they own with them.  This is nothing but pure logic based on current thinking in the airline industry.  Also, it's time that standing sections be implemented in airplanes for those who think paying for a seat is a frill and without the seat, again, it is cheaper to fly the passenger.  And another thing - why not offer short courses to passengers that train them to act as flight attendants for a discount on their fare. This way another fare is charged and the salary and expenses of a flight attendant are dispensed with.  Man, there is still a ton of ways for airlines to save money if they just think outside the box.