difference between canada post expedited parcel and xpresspost

What is the difference between Xpresspost and Expedited Parcel?

Xpresspost is nearly double the cost and Priority is triple the cost. The destination is much further (~4200km) and it is a lower populated area, which adds to the delivery time. Xpresspost and Priority will go by air whereas Expedited will still travel via truck.Feb 20, 2015