Related Clues:
- Fliers' requirements
- Admission requirements, sometimes
- Many offer a DOB
- They're checked at checkpoints, in brief
- Annual bill
- Dog tags, e.g.
- They're sometimes checked at checkout
- What bouncers check
- Dog tags et al.
- Bartenders check them
- Name-tags, for short
- Tags
- Check users' needs
- Air travel needs, for short
- Passports, e.g.