Here's a good one that I think a lot of the 2 or 3 (Triangle) ufo sightings come from.

The NOSS satellites commonly can be seen in a double or triple configuration.

Here is an example image https://i.ytimg.com/vi/7XAxIsInxSM/maxresdefault.jpg

China also launched triple satellite configurations into an almost identical orbit.

http://www.satobs.org/noss.html