Where is the modern Elantra air flow sensor?

The intake flow sensor is generally installed on the intake pipe of the engine, behind the filter element of the air cleaner and in front of the throttle body.

I.e. between the air filter element and the throttle valve. Intake air flow sensor is a technical term of automobile, also known as "air flow sensor" and "air flow meter". The air flow sensor is an instrument that converts the intake air flow into an electrical signal, and it is a sensor that measures the intake air volume in the automobile intake system.