Fake invasions by aliens from outer space? Or illegal aliens?

Any ways to the north about 10 miles at an altitude of about 40,000ft at the bottom of the spacecraft. I and the wife saw a spacecraft so huge at dusk travelling from west to east at about 600 mph while a passenger jet flew underneath it from east to west. The red tail light blinked four times and reflected off the bottom of the space craft. It was several miles in length. I seen a few more, so wait until you get to the outback and have nothing to do for entertainment and so you watch the sky. Then try not to crap your pants or piss yourself or have a heart attack or stroke. What is truly out there is ...