Four planes in sky
Four planes flying in tight formation
these are jets on air
the jets are four in number
the sky is blue in color
Four planes with yellow and blue flying.
Fluffy white clouds in the sky. 
Sky has clear blue weather. 
Four planes flying high above the clouds. 
this is a sky
these are jets flying
the sky is blue in colour
four jets in flight
planes flying in formation
seven yellow planes are flying in formation under the clouds