Just because the Watchtower was destroyed doesn't mean zeta beams platform network was taken down.  It'd be a simple matter to wire up a secondary control center.  I only push for it because it'd make travel a lot simpler outside of teleportation magic or some other tech based, and possibly unreliable, means of transport.  That said, thanks for answering the boom tube side of things, but boom tubes are meant for much longer distance of travel, like between galaxies long.