Conversation so far:
what is the difference between est and et
In the United States and Canada, this time zone is generally called Eastern Time ET. Specifically, it is Eastern Standard Time EST when standard time is observed in the winter.
how many US states are included in the Eastern Time zone
The Eastern Time Zone is a time zone encompassing part or all of 22 states in the eastern part of the contiguous United States.
what other countries are a part of the eastern time zone
Parts of eastern Canada, the state of Quintana Roo in Mexico, Panama in Central America, and certain Caribbean and Atlantic islands, along with certain parts of South America.

Question: what is the largest city in this time zone
Self-contained rewrite: what is the largest city in the eastern time zone