[Suicide Junkie]

If the ship is on the warppoint already, I think it might be closed on day 1.
Otherwise it will be closed when you arrive.

If you tell the ship to move around you can give your fleet time to get through before it closes.

If you time things exceptionally well, you could even have one ship open a warppoint, send the fleet through and then close the point with a second ship during a single simultaneous move turn.