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The Huntsville International Airport is served by several regional and national carriers , including Delta Air Lines , United Airlines , Frontier Airlines , Silver Airways and American Airlines .
 Huntsville International Airport, Delta Air Lines, United Airlines, Frontier Airlines, Silver Airways, American Airlines
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Huntsville International Airport, Delta Air Lines, United Airlines, Frontier Airlines, Silver Airways, American Airlines