I think I have a decent grasp, but it's the details I'm worried about.  I think there's more to it than buying a car...  So, I look at a plane.  I like it.  The seller and I sign a purchase contract.  I give them a deposit.  Then the plane goes to pre-buy.  It passes to my satisfaction.  Then what?  I just hand them another stack of cash and they fill out a bill of sale?  I keep reading about title and escrow services and such, but I have no idea how that works, if it even needs to be done.