I believe the Azores are administered by Portugal. Portugal is a CEPT country.
U.S. hams can operate from CEPT countries with no additional licensing requirements.
However, CEPT recently changed their classifications for U.S. hams. Previously, the General Class was given full CEPT privileges. Now, unfortunately, you will have only VHF/UHF privileges under CEPT.
If you have time, consider upgrading to Extra, so you can operate HF from the Azores. http://www.arrl.org/FandES/field/reg...cept-info.html
EchoLink, IRLP, Allstar and DSTAR linking - adding interest to repeaters worldwide 24X7