How do you communicate with unauthorized/unidentified aircraft?

Question

I’ve seen movies in which pilots communicate with unauthorized planes in order to force them to go away/land nearby immediately.. etc.

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Do all planes from all countries have an universal radio frequency? (Even ones flying illegally?) How does it work?

In: 110

Answer 1

Everyone else has described 121.5, but there is another method for use if that fails. There is a single sign that can be given physically by an aircraft. That sign is wiggling the wings. It can have two meanings: “You have been intercepted. Follow me to an airport and land where I land, or you will be shot down.” Or: “I acknowledge your interception and intend to follow you to the airport and land.”