1. He was flying above the clouds.

2. He was flying over the clouds.
(Are both the same in meaning?)

3. The bird is flying to the south above the clouds.
4. The bird is flying to the south over the clouds.
(Is there any diferences between them?)

5. The balloon is moving above the clouds.
6. Teh balloon is moving over the clouds.
(Is there any difference in meaning? Do you use 'above' or 'over' in this case?)

7. The airplane was going fast above the clouds.
8. The airplane was going fast over the clouds.
(Are both OK? Are they the same in meaning?)

All are fine ... as Steve indicated in an earlier post.

1. "He was flying above the clouds" and "He was flying over the clouds" are similar in meaning, but there is a slight difference in perspective. "Flying above the clouds" generally implies that the object is positioned at a higher altitude relative to the clouds. This phrase suggests viewing the clouds from a top-down perspective. On the other hand, "flying over the clouds" typically means that the object is flying at the same altitude as the clouds or slightly above them. This phrase suggests a more horizontal perspective, where the clouds are being passed by as the object moves forward.

3. "The bird is flying to the south above the clouds" and "The bird is flying to the south over the clouds" have similar meanings, but the word choice conveys a nuanced difference. "Flying to the south above the clouds" emphasizes that the bird is maintaining a higher altitude while traveling southward. This phrase suggests that the bird is intentionally staying above the clouds for a specific reason, such as for better visibility or avoiding obstacles on the ground. "Flying to the south over the clouds" generally means that the bird is traveling south while either at the same altitude as the clouds or slightly above them.

5. Both "The balloon is moving above the clouds" and "The balloon is moving over the clouds" have a similar meaning, but "above" is more commonly used in this context. "Above the clouds" suggests that the balloon is at a higher altitude than the clouds, while still maintaining a general direction of movement. "Over the clouds" could imply a more level movement, as if the balloon is skimming or gliding just above the surface of the clouds.

7. Both "The airplane was going fast above the clouds" and "The airplane was going fast over the clouds" are acceptable and have similar meanings. They convey that the airplane was moving quickly while positioned at a higher altitude than the clouds. However, "above the clouds" is used more often in this context as it implies a greater vertical distance from the clouds, while "over the clouds" suggests a horizontal movement across the clouds.