When would you use flight for a collective noun?

You wouldn't use "flight" as a collective noun for most situations. Here's why:

* Flight typically refers to the act of flying or the journey itself.

* Collective nouns represent a group of individuals (like a flock of birds, a herd of cows, a team of players).

However, there are a couple of exceptions:

1. "A flight of stairs" is a common idiom. Here, "flight" refers to a group of stairs in a staircase.

2. "A flight of fancy" is another idiom where "flight" is used figuratively to represent a sudden burst of imagination or creativity.

In general, if you are trying to describe a group of flying creatures, you would use other collective nouns like:

* Flock (for birds)

* Swarm (for insects)

* Gaggle (for geese)

* Pod (for whales)

Let me know if you'd like more examples of collective nouns!