The other day, I started the Special Delivery quest. I had to head out to the Parsons State Insane Asylum, so I decided to go there via Vertibird. I boarded a VB near the USS Constitution and flew in the direction of the Asylum. As soon as I got over the river near the Asylum, the game crashed to the console menu. This happened twice. So, I ended up flying to Listening Post Bravo, and walk the rest of the way, with some swimming involved.