What should you do if you have ATIS before contacting ATC?

When you have received the Automated Terminal Information Service (ATIS) before contacting Air Traffic Control (ATC), it's important to include the ATIS information in your initial transmission. The purpose of ATIS is to provide essential information about the current weather, active runways, and other pertinent data to help pilots make informed decisions prior to contacting ATC.

By including your ATIS information in your initial transmission, you demonstrate that you are aware of the current conditions and information relevant to your flight. This helps streamline communication and allows ATC to effectively provide you with any further instructions or clearances based on the most current information.

Providing the ATIS information also helps ATC confirm that you have correctly received and understood the pertinent information, thereby reducing the possibility of miscommunication. This practice is standard protocol in aviation and greatly facilitates safe and efficient operations at busy airports.