Final Flying...
Step 1 : some basic shapes
Step 2 : convert them into volume VDB
Step 3 : add and find the "good" noise
Step 4 : volume shader of Redshift
Step 5 : a little bit of video editing because it's always better with !
Step 6 : and... Voilà!
Step 7 : Yes I can work for you as a freelance ! 😉
Result of some tests to create "real clouds" with Houdini without any simulation, just for fun ! Enjoy !