A few examples :
- They have white or very light hair (not necessarily natural)
- they have long nails like ruben's
- their outfits consists of many layers, usually translucent or white
- The skin of their wings is very healthy and has an iridescent glow to it!

The society of air dragon is the most unbalanced of all societies, the gap between the lower and higher classes is big...! And the royalty tries its best to distance itself from what the "regular" air dragons look like... (air dragons don't normally have white hair. that's just royalty doing its thing)