tail of plane in sky.
sky is very cloudy.
tail of plane is gray.
sky looks dark and stormy.
sky looks stormy and dark.
clouds are white in sky.
two planes in cloudy sky.
an airplane tail in the foreground
the sky is grey
the sky is cloudy
a silver airplane tail
grey and brooding skies
white clouds gradually darkening
a dark gloomy grey sky 
the tail of another large plane 
it is a gloomy day
tail of airplane
a plane flying through the cloudy sky over a pole