Abstract: A vehicle flag system includes a flag, a flag mast and a window mount. The flag mast includes a base configured to be lockingly received in a socket formed in the window mount. The mast base is formed with an axial tenon which mates with a mortise formed in the socket. A pair of spring legs project from the base parallel to the tenon and each is received within a channel formed in the socket. The spring legs include enlarged latches at their ends and the spring legs are compressed toward to the tenon when the tenon is inserted into the mortise. When the tenon seats fully in the mortise, the latches register with cut out portions of the socket wall and spring outwardly. To release the base from the socket, the latches are manually compressed toward the tenon.