A good rule of thumb on 'free shipping'. The sender is very likely to use the least expensive method available.
On FedEx's end, think of your package as a passenger on a plane, except the plane takes off not on a timed schedule, but when a certain threshold of passengers are on board. A plane that is largely empty and has to burn fuel whether it's empty or full to get where it's going, makes no money.
Hope that helps.
On FedEx's end, think of your package as a passenger on a plane, except the plane takes off not on a timed schedule, but when a certain threshold of passengers are on board. A plane that is largely empty and has to burn fuel whether it's empty or full to get where it's going, makes no money.
Hope that helps.