The Stealth Bomber literally has DECLAS authority under EO 13526 section 3.1(d).
"the need to protect such information may be outweighed by the public interest in disclosure of the information, and in these cases the information should be declassified. When such questions arise, *they shall be referred to the agency head * or the senior agency official. That official will determine, as an exercise of discretion, whether the public interest in disclosure outweighs the damage to the national security that might reasonably be expected from disclosure."