This is a goofy thread but ill comment on something since another poster seemed to take offense to it.

It is an excellent point that over the years, sightings have not only decreased but also that the phenomina follows modern cultural and technological attributes.
You would think UFO's wouldn't change much even in fifty years. Because its alien... because a ship isnt going to radically change much.

In 1970 a UFO description sounded like something from Buck Rogers

Today it sounds like something from Farscape.

This thread brings into focus a slow change over a time period that clarifies that many observers of these "Alien craft" were inlfuenced by.