I saw a craft at high altitude flying in a straight trajectory from the north to the west according to my iPhones compass and the posit

The craft was literally lighting up consistently until reaching very bright whitish color and then fading to black or dark (no longer visible) but following where it’s trajectory was heading would reappear consistently lighting up more and more again to a very bright white, as if it were “powering up”. The craft repeated this four times and then completely disappeared. The speed that’s this thing was traveling had to be at least 5-10 times faster than any commercial aircraft I’ve seen in the night skies. If I wasn’t looking up at that exact time I never would have seen it. The whole experience was only 6-8 seconds and I’ve never seen anything like it before.