Hi we are using the FXML3 API and retrieving the FlightInfoStatus the documentation states that there are fields for terminal and gates:
|gate_dest |string? |Gate at the destination airport, if known|
|gate_orig |string? |Gate at the origin airport, if known|
|terminal_dest |string? |Terminal at the destination airport, if known|
|terminal_orig |string? |Terminal at the origin airport, if known|