something flying in and out of formation within a triangle shaped constellation

My family and I were coming back from Pecan Land Mall in Monroe on Highway 165, when I noticed something odd about a Constellation.     I like to watch the sky when riding in the car.....There is a Constellation, that I don't know what is called,  but it looks like an arrow or an arrow head or a triangle with 3 stars that come off the bottom.     Anyway, I got to noticing that the stars(?) between the three main points of the triangle were flying off and disappearing and then coming back and getting back where they were to beging with..... We watched this all the way home and then went out to our tiny little airport and continued to watch it out there.     I sure would have liked to have had a video camera because this would have been easy to film.     We have no idea how long this continued to go on because we finally went home.     We decided that it was more than likely some kind of Military stuff.     Did anyone else report this oddity.     Every time I see the triangle in the sky I can't help,  but to watch it for a while to see if it is going to happen again and that has been many years ago.
Time and date are approximate.  PD