Originally Posted by
alanR
Bangor - New York North
BGR is 439 highway miles northeast of NYC.
The big issue would be immigration/customs facilities. Underused airports such as SWF and PSM have them; BWI's international facility is large but very underused except for military charters.
If they existed at small airports, Ryanair would be looking at the likes of CEF, TTN, ILG and HGR.