and...found this:
"The ICAO Convention requires that aircraft equipped with radios have a radio station license and an operator's permit. In the United States, the Federal Communications Commission (FCC) sets the rules for aircraft radio licenses.
To fly internationally, FAA pilots need a Restricted Radiotelephone Operator Permit (RP). This permit is valid for life and doesn't require a test. To get an RP, you can:
- Register for an FCC Registration Number (FRN) on the Commission Registration System (CORES)
- Log in to the FCC's license management system
- Select RR - Restricted Radiotelephone from the drop-down menu
- Follow the instructions
- Pay the fee
- Receive an email link to view your permit
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You can also apply for a Restricted Radiotelephone Operator Permit with Limited Use (RL) if you're not legally eligible for employment in the US."