White is the most common color of commercial planes

White surfaces absorbs less heat and lowers the risk of solar radiation damage

Cracks and damages are visible, can be spotted from long distance easily

White color does not fades easily and even if  it fades, plane will still be white

Due to white color its visibility increases and helps to keep birds away

As per economical reasons white color is cheaper than dark colors

Painting in simple and plain way will reduce un necessary expenses

Hope this information is helpful for you