The answer is YES, in theory. TSA is supposed to allow you access to the checkpoint of any terminal at an airport where you have a valid boarding pass for a departing flight on the same day.

In many major U.S. airports, you are permitted to go through TSA security at a terminal other than the one your flight departs from, provided the terminals are connected "airside" (beyond security) or you have a valid boarding pass for that day. This is a common strategy for travelers who want to access a specific premium lounge, dining option, or a shorter security line (such as a dedicated TSA PreCheck lane) located in a different building. However, this is highly dependent on the airport's physical layout. At airports like San Francisco (SFO) or Orlando (MCO), most terminals are linked, allowing you to walk or take an internal train between gates without re-clearing security. At others, like LAX or New York-JFK, some terminals are completely isolated, meaning if you clear security at Terminal 4 but your flight is at Terminal 7, you would have to exit, take a shuttle, and clear security a second time. Always check the airport map first to ensure there is a post-security connection; otherwise, you risk missing your flight due to the time required for double-screening.