I don't think that I have recently received any free stuff. The airship is currently docked on my airfield and I have some stuff offered at a discount cost but not free. It seems like another inducement to spend the green money. I was offered a duty free collection for 5000 coins instead of the regular price of 3 green notes, but duty free goods just produce a relatively minor amount of coins when used in the DF shop, so it's not much of a deal.
I think that for the first couple of months, there might have been a few freebies to get my interest, but an airship arrival is not much of an event any longer.
My advice is that you shouldn't expect much return but the airship is fun to see.