"Clean on board" is a phrase that is commonly used in the context of air travel. It means:
"Clean on board"
This phrase is used to indicate that the airplane is clean and well-maintained. It is often used by passengers to express satisfaction with the cleanliness of the aircraft.
Example:
"The plane was clean on board, and the crew was very polite."
Notes:
- It is not a standard phrase in the English language, but it is commonly used in the aviation industry.
- It can also be used in a more general sense, such as in a car or a boat, to mean that the vehicle is clean and well-maintained.
Let me know if you'd like a similar phrase in other contexts!