White dot at cruising altitude moving in a zig zagged linear direction.

I was sitting on my front porch when I noticed what I initially thought was a particularly bright star.  Realized it was moving and my next thought was satellite.  It was moving slowly in a linear fashion so that made sense and I thought hey that's pretty cool.  It then appear to shift slightly one way then back the other before continuing in its linear direction.  Thought my eyes were okaying a trick on me so I concentrated on it intently for a few minutes and it was definitely making slight harsh zags to the left and right occasionally.  My guess is whatever it was was at cruising height for aircraft so my, admittedly uneducated assumption was the zig zag pattern had to be pretty significant to observe from my distance.  I only saw one these objects in the 5 minutes I was observing it.  I observed it as being well above the tree-line against a mostly clear sky.  The view from my porch faces east about a mile from the ocean.