Why don't airlines charge by a customer's weight?
Would it be legal and practical  for airlines to charge by weight?
How strict are airlines about the 7kg hand bag allowances? Can we carry tennis racquets in a flight to the US? Do airlines charge extra for carrying them? How much water do airliners carry? Is carrying a powerbank in cabin baggage allowed on Indian airlines? What is the charge for extra luggage in a domestic flight? In light of the recent AirAsia crash, do budget airlines cut costs when it comes to safety? Can a couple carry 1 bag with a total weight of 30 kg in indigo flight instead of two 15kg bags? Can I carry two hand baggages on board on jet airways? Is Qatar Airlines lenient on the excess baggage fine? Should I carry a power bank (external battery) in airplanes? Would passenger airlines be safer without human pilots? What is the procedure to fly non-revenue on domestic airlines? Is a passenger airliner designed to do barrel rolls? Is it common for Copa Airlines to lose bags? How much does it cost to fly using a private jet? As a pilot, would you prefer to fly cargo or passengers? How much liquor is allowed to be carried by an individual if he/she is travelling in a domestic flight? While traveling from US to India which Airlines allow maximum luggage for an economical class traveler? How do pilots determine the weight of a passenger flight before take off? How much does extra baggage cost on Emirates Airlines? How much does it cost to start an airline? Why do airlines allow guns and ammo on checked baggage? How safe are the airlines? Does the freight model of an aircraft cost less than the corresponding passenger model? If a flight is almost empty, will the airline cancel it to cut costs? Why has Priceline only charged half the amount for my airline tickets? How much does air freight really costs (per Kg)? What are the fixed costs and variable costs of a major airline? Can a Beechcraft King Air 350i be flown legally by one pilot? Why do so many airlines offer online excess baggage at 80% discount when they could collect 100% fee at the airport?