Originally Posted by bdk234

The problem with implementation is that nowadays tickets are usually purchased through travel companies like ebookers etc because they can sell cheaper than the airlines themselves, and when booking with them you have no way of knowing if you've gotten the "Light" fare or not. So passengers end up essentially being held hostage at the airport and forced to fork over substantial sums of money, often meaning the airlines end up making more on a Light ticket than they would if the passenger had just bought a standard ticket.