I went out side to check on my chickens and to have a smoke I looked up and seen a nice streak across the sky. It went from the north to the south. I have been watching the sky lately and have been seeing these a lot always from the north to the south(past month seen about 10).. Also been seeing a lot of aircraft flying back and forth in the sky not sure the type of plane but they are big. We live the airport but these aint commercial airliners. The planes fly low while other are way up there they seem to fly only at night. Anyone in east Austin/Del Valle area verify the planes or what type they are?