b1a may refer to: * Rockwell B-1A Lancer, U.S. USAF bomber aircraft * GSR Class B1a, a steam locomotive class * B1A section, a WWII counterespionage unit in the

Double-Cross System The Double-Cross System or XX System was a World War II counter-espionage and deception operation of the British Security Service ( MI5). Nazi agents in Britain – real and false – were captured, turned themselves in or simply announced themse ...

(XX System) * B1a cells, a type of B1 cell * B1A postal code, see List of postal codes of Canada: B

See also