TV movie about a family on a spaceship to Andromeda who go through a black hole

I remember a TV movie I saw after school in the 70's.

It was about a family going on a space ship to the Andromeda galaxy (no I am not talking about Lost In Space).

They have some crisis and end up going through a black hole presenting the opportunity for future shows which as far as I know never happened.

I believe their space ship was shaped similar to the body of a 727 airliner without the wings.

I have never seen this movie again although for the 70's it was pretty good.