Related Clues:
- Damping ratio symbols, in engineering
- Preceders of xis
- Predicted touchdowns, for short
- ORD or LAX figs.
- Prof's aides
- Info from airlines
- Prof's helpers
- Cockpit announcements, briefly
- Some proctors, for short
- Greek openers
- Letters from Plato
- Announcements at LAX
- Expected landing hrs.
- Logan info
- Letters before xi's