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"): At the time of the initiation of this route, Twin Cities was the only scheduled carrier into the Yarmouth Airport, and was the only scheduled international service into the Portland International Jetport.
Relevant evidence: No