following a boeing 737, the ufo slithered in the sky like a snake, there were 4 pairs of red and green lights on the craft

i was outside fooling around in the snow with a friend and that friends sister, basically i got hit by a snowball very hard (probably layed on the ground for 20 seconds) then i opened my eyes and saw my friend and his sister leaving, i looked up at the sky and saw a plane (boeing 737 probably) the lights on the plane dimmed and a craft appeared. the craft was long thin and had 4 pairs of green and red lights on it. i looked at it for about 20 seconds then ran to tell my friend and i lost sight of the craft