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NIDS makes the case that Big Black Deltas, or BBDs, are U.S. Defense Department airships. They are so large they can carry massive payloads at low altitudes, cruising at speeds three to five times as fast as surface ships.
There appears to be an increase in deployment of these vehicles," Kelleher said. "The only time you see these things are when they are leaving or coming in. A lot of these sightings are at night. OUR INFORMATIONis that they spend a long time aloft, weeks at a time. They can be thought of as ocean-going ships, rather than aircraft," he said.
The BBDs have been seen accelerating very rapidly from a hovering position. "They can look as though they are leaping across the sky. Being silent, it's almost spooky," Kelleher said.