Instead of dividing your flight into classes, you could also strip your base ticket experience bare and nickel-and-dime your customers for everything from faster check-in to carry-on luggage to in-flight Wi-Fi.

We call these “peanut airlines” because you fly for “peanuts”, and get only peanuts on board. If you've flown Spirit Airlines, with plane tickets sometimes cheaper than train tickets, you've flown on a peanut airline.