When a package is shipped from Alaska to someplace in the Lower 48 using Parcel Post, how is that package usually transported ? By truck or Airplane ? Had a package shipped out yesterday from AK and the USPS shipping site, said it should arrive by April 5th, 2014. Since it came from Interior Alaska, they are off the Road System. I know it has to be transported by air mail from there to Anchorage. The big question is does Parcel Post transport by truck from Anchorage or air mail ?