Black triangular UFO over Corpus Christi on April 1977

On April 8, 1977, a witness was going camping in Corpus Christi, Texas. From this point, he saw a black triangular-shaped UFO

Eyewitness statement:

Siting took place during a childhood camping trip along the national seashore on Padre Island near Corpus Christi, TX in 1977. We were sleeping in our RV on the beach and I woke up because I was hot. When I went to open the roof vent more, I remember seeing this large triangular-shaped craft silently moving in a NE direction over our RV. I distinctly remember seeing an exhaust plume that was multi-colored and lights on each of the three corners. I believe one was orange and the other two corners had Blue-white colored lights.

Source, 18th March 2018