Snowflakes flutter in the air.

飞雪花了。

《新英汉大辞典》

Leaves flutter past the window, up and away; down in the avenue a whole newspaper wags in the air like a lost kite and falls, spiked on a pine tree.

树叶儿在窗外飘摇而过，高高地卷向远方；林荫道里，挂在松枝上的一张完整的报纸，像断线的风筝飘飞到半空，然后又晃晃悠悠地掉下来。

youdao

The hairs flutter in moving water as flags do in moving air, and the way in which they flutter contains information about the direction and speed of the water moving past them.

绒毛在水中就像气流中的旗帜一样摆动，它们摆动的方式包含着流经它们的水流方向和流速信息。

youdao

The 17.3-inch long dragonfly drone can flutter through the air in any direction, and even hover, just like its biological inspiration.

ENGADGET: BionicOpter dragonfly drone flutters about, blows minds

Since He is much less dense that air (He has only 14% of the density of air) the drag and flutter of the platters in the drives is reduced.

FORBES: Rare Gases and Fine Lines