The Kardashians started off their Costa Rica trip in style ... hopping on Dan Bilzerian's infamous party plane for the ride there.
We're told the Kardashians rented out Dan's 16-seat Gulfstream G4SP to take them to the tropical country. The plane has certainly had its share of hot babes roaming the aisle.
The trip wasn't cheap -- $120,000 round trip.
Hangers-on not included.