BBH system model. The two black holes can have an accretion disk and can eject VLBI components. If it is the case, we observe two different families of trajectories and an offset between the VLBI core and the origin of the VLBI component if it is ejected by the black hole that is not associated with the VLBI core. The angles Ω₁ and Ω₂ between the accretion disks and the rotation plane of the BBH system can be different.