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In 2004 , Eastern Slopes Aviation began to try to secure funding for development at the airport , including the construction of a terminal and the establishment of commuter service from the airport to Portland , Maine , slated to begin in spring 2006 .
 Portland , Maine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Portland , Maine