I heading home from houston in an airplane. the captain called over saying that we were 10,000 ft. i looked out the window down at the city and took a picture of it on accident. when i took the photo i noticed these lights in the sky, i pressed my face against the window and saw with my eyes. when i went to lift up my phone to take another picture, it was gone without a trace. it was about 21:30 at night. the cabin was 90% black. in the photo the reflection of the phone faintly overlaid the lights, debunking that they were cabin reflections. it's was to high to be fireworks and to close to be stars and to far and small to even be lights from the cabin. there were 8-9 lights all in a boomerang or triangle pattern. the lights themselves on the picture when i zoom up on them, look to have a window such feature on them, they have a verticle bar the separates them like a household window. i lost sight mid transition from the window to my phone.