Most RainWings don't actually know how to take flight from the ground, having been in the trees their whole lives. They also tend to dip and swerve and find it difficult to fly in a straight line even in open sky, because they're so used to having branches to weave and glide through. Glory is an exception and has a very unique flight pattern, being a RainWing who was raised apart from other RainWings.
NightWings fly silently like an owl.
SkyWings can soar and circle for long periods of time because their wings are just so dang big. They are the most well adapted dragons to high altitudes as well and can fly higher than other dragons for longer periods. They can also fly upside down.
HiveWings dart and buzz and hover. They sound kinda like a helicopter. It takes a lot of energy so they need to eat a lot of sugar.
SandWings can also soar for pretty long periods, they naturally try not to flap their wings very often to conserve energy. Some of them tend to tilt their wings up and wobble on the wind like a vulture.
SeaWings take the longest of the Pyrrhian tribes to learn how to fly, due to lack of necessity from living in the water.
All dragons need to take a bit of a running start in order to take off.
It's stated in 999's file that there is no mention of a mouth or eyes, so my Headcanon is that picked up random shit for eyes to appear a lot more friendlier and creep others out.
A wonderful Pokemon chinese animated short film directed by DaiWei (All Saints Street) and produced by MTJJ / HMCH studio (Legend of Hei) for Chinese New Year.