[Panama Red]

UP 1.8 is built on top of HSFX 4.0. As a result, it has more planes and a few other items that are not included in HFSX 4.0.

When HSFX 4.1 comes out it should have the same planes as UP 1.8 and maybe some more items, but at this point UP 1.8 is the leader in new stuff.