I animated the propeller texture for the bomber plane so that it doesn't look frozen while flying. Uploaded with permission from Bapaul.
How to Install:
Navigate to your Frontline folder (probably in your tf/custom folder)
Go to Frontline_Supply_Drop_v1.x.x/materials/models/props_frontline
Place the new .VTF and .VMT in there and replace the ones that were already there.