1541z 263.050 EMPIRE 11 wkg ZBW descending, ID as single ship. 1543z 119.750 EMPIRE 11 working Portland approach (KPWM) for runway 29 full stop. Not sure but sounds like it's an F-18 instead of a US Customs plane. I'm heading to Portland in an hour, I'll try to get a visual ID on the plane. Ed Langworthy Gray, ME