Originally Posted by ChristiaanJ
Even without a vertical tail, the rear end of the fuselage provides some "weathervane" stability, ...
Modern Airliners are not realy designed like a "weathervane". Large part of the fusalage is ahead of the CG as opposed to e.g. the B52. The lateral drag of the fuselage that incurs ahead of CG generates a destabilizing yaw moment, the lateral drag aft of CG generates a stabilizing moment. I.e. the larger the part of the fusalage aft of CG, the better the a/c will fly without VS.
A swept wing without a fuselage doesn't need a VS to fly:
Horten Nurflugels