When the president travels by air, various security measures are implemented to ensure their safety and the continuity of the government. One key measure is that senior government officials often travel on separate planes and vehicles to the same destination, reducing the risk of a single accident or attack compromising the entire government. Additionally, Air Force One and other designated presidential aircraft are equipped with advanced security features and communication systems to protect the president during air travel. Specific protocols and emergency procedures are in place to handle any potential threats or emergencies that may arise during the journey.