"Fly the freight engine to Trevor's airfield" is an objective in the story mission Sidetracked in Grand Theft Auto V.
Walkthrough[edit]
With the Freight engine as your cargo, fly on back to Trevor's Airfield. Get it over the marker and drop it on down onto the ground. That is just part one.
Once you make it back to the airfield, you will see a freight truck is waiting there. Line up the Train with the trailer and drop it.
