"Originally developed by the Enclave, the Vertibird can be found in Special Encounter Old Warehouse. It is the best vehicle. You can meet forced Random Encounters regardless of its ability to fly! It's the only vehicle that can go above the ocean. It is the quickest vehicle. It's one of the most powerful pieces of Enclave technology, while the Brotherhood is still patrolling in hummer, the Enclave AND Players can go anywhere quickly with its powerful helicopter rotors. Its is possible to fly over the ocean and to a island for the creation of tents/bases."
And you can't put a price on cool.