Question: Twin Cities Air Service is an American fixed-base operator and charter airline based at Auburn, Maine and operating from Portland International Jetport, a public airport two miles (3 km) west of downtown Portland, in Cumberland County, in which state?
Sentence (from "Twin Cities Air Service"): The airline is a certified Part 135 operator, providing on demand and commuter service, while the FBO provides standard aircraft services and maintenance, specializing in overhauls of the Cessna 400 series aircraft.
Relevant evidence: No