Answer:
Up on high I wave away but not a word can I say.
The lunch destination of choice for teenagers and hospital employees.
What occurs four times in every week, twice in every month, only once in a year but never in a day?
What is in seasons, seconds, centuries, and minutes, but not in decades, years, or days?
War fought with pieces on a board.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?