Two sets of faint orange lights appering to each be silently flying in v formationsFrom an apartment balcony a friend and I saw two sets of faint orange lights flying in v shapes. One set was about ten lengths ahead of the other. Neither of us saw them appear but both sets faded away as if they became too distant to see. They were silent. I am an a&p mechanic and aircraft enthusiast and was unable to identify this sighting.