Here are some options you could consider, based on the nature of an airship and the role of the sailors:
Playing on the "airship" element:
* A cloud of sailors
* A constellation of sailors
* A fleet of sailors (This is common for ships, but could be applied to an airship)
Playing on the "sailor" element:
* A crew of sailors (This is the most common and practical option)
* A company of sailors
* A band of sailors
Ultimately, the best choice would depend on the specific context and the desired effect. You could even create your own collective noun for sailors on an airship, such as:
* A skyward
* A zephyr
* A sky-borne
It's up to you to choose what fits best!