Northrop B-2 Spirit

The B-2 Spirit is a U.S. Air Force, Northrop Grumman-built stealth bomber designed for penetrating hostile air defenses to deliver both conventional and nuclear weapons, featuring a unique flying-wing design without a tail for radar evasion. Currently, 19 B-2s are in service, costing over $2 billion each, and are maintained in climate-controlled hangars due to their delicate radar-absorbing surfaces. The B-2 will be replaced by the B-21 Raider around 2032.

Via: The B2 Spirit bomber has a clever mechanism to close its refueling port to keep a slick surface for stealth. https://x.com/engineers_feed/status/1968755597081297014