Satellite 15...The Final Frontier

Hi folks! I believe there's an error:

Must say my goodbyes, if only a line, (NOT if only a time,) (A message of one line only, at least, would be appreciated) a message to tell them in case they might find...

This song can mean a lot of things:

• Space
• Death
• The End Of Iron Maiden
• Whatever a listener can relate to...

Thanx