Will a birth certificate and ID work when flying from the us to Guam?

Yes, a birth certificate can be used as a form of identification for domestic flights, including flights from the U.S. to Guam, which is a U.S. territory. However, it's advisable to also carry a government-issued photo ID, such as a driver's license or passport, as these are generally preferred by airlines and security personnel. Always check with your airline for specific ID requirements before your flight.