1) more checked bags means less passengers wasting time fighting for non-existent overhead bin space. Less hassling with flight attendants. More efficient loading; planes have a better chance of pulling away from the gate on time. What cost savings there are to a more hassle-free boarding process, I wouldn't know how to quantify.
2) Passengers will bring carryons knowing ahead of time there will be no bin space and it will have to be checked at the jetway. (The ground crew takes the last bags down the stairs and and tosses them into the plane.) These "checked" bags don't pay the fee. Eliminating the checked bag fee removes the incentive for this loophole. However, I wouldn't know how to quantify the savings.
1) more checked bags means less passengers wasting time fighting for non-existent overhead bin space. Less hassling with flight attendants. More efficient loading; planes have a better chance of pulling away from the gate on time. What cost savings there are to a more hassle-free boarding process, I wouldn't know how to quantify.
2) Passengers will bring carryons knowing ahead of time there will be no bin space and it will have to be checked at the jetway. (The ground crew takes the last bags down the stairs and and tosses them into the plane.) These "checked" bags don't pay the fee. Eliminating the checked bag fee removes the incentive for this loophole. However, I wouldn't know how to quantify the savings.